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Discussion Starter · #1 ·
I just want to start off by encouraging people to refrain from posting chit chat and non useful information. Lets attempt to keep this on track and just post up solid laws and references. Attempt to format following posts the same as mine with a copy of the law and a link to where it can be found in it's entirety.

My intent behind this is to help everyone arm themselves with actual copies of the law just in case you get pulled over. If you can show an officer that you aren't some moron kid and that you have modified your car within the confines of state regulation you may just avoid that ticket and keep yourself out of court. I have been doing this for quite some time and it works, if nothing else it confuses them completely when you hand over legal scripture while they are attempting to lecture you.

OREGON; http://www.leg.state.or.us/ors/815.html

815.250 Operation without proper exhaust system; exemptions; penalty. (1) A person commits the offense of operation without proper exhaust system if the person drives or moves on any highway or owns and causes or knowingly permits to be driven or moved on any highway a motor vehicle that is not equipped with an exhaust system that meets the requirements under this section.
(2) An exhaust system only meets the requirements of this section if all of the following apply:
(a) The exhaust system must be in good working order.
(b) The exhaust system must be in constant operation.
(c) The exhaust system must meet noise emission standards determined by the Department of Environmental Quality to be substantially equivalent to the following standards based upon a stationary test conducted at a distance of 25 feet in accordance with procedures established by the Department of Environmental Quality:
______________________________________________________________________________

Maximum
level, Model,
Vehicle type dBA Year

I. Motor vehicles required to
establish a registration
weight under ORS 803.430
and commercial buses 94............................................. before
1976
91............................................. 1976 and
after
II. Motorcycles and mopeds 94............................................. before
1976
91............................................. 1976
89............................................. after 1976
III. Motor vehicles not described
under I or II 92............................................. before
1976
88............................................. 1976 and
after
______________________________________________________________________________

(3) This section does not apply to the following vehicles:
(a) Vehicles of special interest that are registered under ORS 805.020 and that are:
(A) Equipped with original manufacturer’s equipment and accessories, or their equivalent, and that are maintained in safe operating condition; or
(B) Street rods that conform to ORS 815.107.
(b) Road machinery, road rollers or farm tractors.
(c) Antique motor vehicles that are maintained as collectors’ items and used for exhibitions, parades, club activities and similar uses, but not used primarily for the transportation of persons or property.
(4) The court in its discretion may dismiss a citation issued for violation of the offense described in this section if evidence is presented that the exhaust system complies with or has been repaired or modified to comply with the requirements under this section.
(5) The offense described in this section, operation without proper exhaust system, is a Class C traffic violation. [1983 c.338 §496; 1985 c.16 §257; 1985 c.393 §23; 1997 c.402 §15]
So print off what is applicable to you, laminate and keep with your proof of insurance and registration. It may save you a ticket and time in court. Also remember our cars are Lancer Evolutions and most officers have no idea what our original equipment is.
 

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Thanks for starting this HW...

CALIFORNIA

http://www.dmv.ca.gov/pubs/vctop/d12/vc27151.htm

V C Section 27151 Modification of Exhaust Systems


Modification of Exhaust Systems

27151. (a) No person shall modify the exhaust system of a motor vehicle in a manner which will amplify or increase the noise emitted by the motor of the vehicle so that the vehicle is not in compliance with the provisions of Section 27150 or exceeds the noise limits established for the type of vehicle in Article 2.5 (commencing with Section 27200). No person shall operate a motor vehicle with an exhaust system so modified.
(b) For the purposes of exhaust systems installed on motor vehicles with a manufacturer's gross vehicle weight rating of less than 6,000 pounds, other than motorcycles, a sound level of 95 dbA or less, when tested in accordance with Society of Automotive Engineers Standard J1169 May 1998, complies with this section. Motor vehicle exhaust systems or parts thereof include, but are not limited to, nonoriginal exhaust equipment.


...and this one is good reading too: http://www.defend-me.com/california-vehicle-code/california-vehicle-code-section-27150-27159.asp
 

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Idaho

http://www.legislature.idaho.gov/legislation/2009/S1092.pdf

1 AN ACT
2 RELATING TO MUFFLERS AND PREVENTION OF NOISE; AMENDING SECTION
3 49*937, IDAHO CODE, TO PROVIDE THAT A MOTOR VEHICLE EQUIPPED WITH
4 A GLASS PACK MUFFLER ADAPTED WITH A BUTTERFLY VALVE IN THE
5 CORE IS NOT LAWFUL TO BE OPERATED ON THE HIGHWAYS OF THE STATE
6 AND TO PROVIDE PENALTIES; AND DECLARING AN EMERGENCY.
7 Be It Enacted by the Legislature of the State of Idaho:
8 SECTION 1. That Section 49*937, Idaho Code, be, and the same is hereby amended to
9 read as follows:
10 49*937. MUFFLERS, PREVENTION OF NOISE. (1) Every motor vehicle shall at all
11 times be equipped with a muffler in good working order and in constant operation to prevent
12 excessive or unusual noise and annoying smoke, and no person shall use a muffler cut*out,
13 bypass, or similar device upon a motor vehicle on a highway. A motor vehicle equipped with a
14 glass pack muffler adapted with a butterfly valve in the core that can be opened and closed by
15 either manual or electronic means from the vehicle’s cabin, thereby causing the muffler noise
16 to become progressively quieter as the valve is closed and progressively louder as the valve is
17 opened, is not lawful to be operated on the highways of this state. When any motor vehicle
18 was originally equipped with a noise suppressing system or when any motor vehicle is required
19 by law or regulation of this state or the federal government to have a noise suppressing system,
20 that system shall be maintained in good working order. No person shall disconnect any part
21 of that system except temporarily in order to make repairs, replacements or adjustments, and
22 no person shall modify or alter that system or its operation in any manner, except to conform
23 to the manufacturer’s specifications. No person shall knowingly operate and no owner shall
24 knowingly cause or permit to be operated any motor vehicle originally equipped or required
25 by any law or regulation of the state or the federal government to be equipped with a noise
26 suppressing system while any part of that system is disconnected or while that system or
27 its operation is modified or altered in any manner, except to conform to the manufacturer’s
28 specifications.
29 (2) The engine and power mechanism of every motor vehicle shall be so equipped and
30 adjusted as to prevent the escape of excessive fumes or smoke.
31 (3) No person shall modify the exhaust system of a motor vehicle or a motorcycle in
32 a manner which will amplify or increase the noise of the vehicle or motorcycle above that
33 emitted by the muffler originally installed on the vehicle by the manufacturer.
34 (4) A showing that the sound made by a passenger motor vehicle or motorcycle exceeds
35 the maximum allowable decibel level shall be prima facie evidence of a violation of subsection
36 (1) of this section.
37 (5) No person shall sell, offer for sale, or install any noise suppressing system or device
38 which will produce excessive or unusual noise.
 

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GEORGIA

This is all I could find that made any sense... then again, with all the ******** in their trucks and musclecars this is probably the entire law. :rolleyes:


40-8-71.
(a) Every motor vehicle shall at all times be equipped with an exhaust system, in good working order and in constant operation, meeting the following specifications:
(1) The exhaust system shall include the piping leading from the flange of the exhaust manifold to and including the muffler or mufflers and tail pipes;
(2) The use of flexible pipe shall be prohibited except on diesel tractors or according to manufacturers´ original specifications;
(3) The exhaust emission point shall extend beyond the rear or outside of the passenger compartment. The trunk shall be considered as part of the passenger compartment;
(4) The exhaust system and its elements shall be securely fastened, including the consideration of missing or broken hangers; and
(5) There shall be no part of the exhaust system passing through the passenger compartment or any exposed stack so located that any individual entering or leaving the vehicle may be burned.
(b) The engine and power mechanism of every motor vehicle shall be so equipped and adjusted as to prevent the escape of excessive fumes or smoke.


'Vehicular Visible Emission Control Act.'​


40-8-181.
(a) It shall be unlawful for any person to operate on a public roadway of this state a diesel powered vehicle which discharges into the atmosphere visible emissions resulting in a decrease of light transmission beyond 30 percent, whether emitted from the crankcase, the exhaust system, or from any part of the power system; provided, however, that the light obscuring limitations prescribed in this subsection may be exceeded during periods of acceleration and deceleration not to exceed ten continuous seconds or 1,000 feet.
(b) It shall be unlawful for any person to operate on a public roadway of this state a gasoline powered vehicle which discharges into the atmosphere visible emissions resulting in a decrease of light transmission, whether emitted from the crankcase, the exhaust system, or from any part of the power system; provided, however, that the light obscuring limitation prescribed in this subsection may be exceeded for periods not to exceed ten continuous seconds or 1,000 feet.
(c) Subsections (a) and (b) of this Code section shall not apply to the normal discharge of condensed water vapor.


40-8-184.
No subdivision of this state shall enact any ordinance or issue any rules and regulations pertaining to the discharging into the atmosphere of visible emissions from diesel powered vehicles or gasoline powered vehicles.

40-8-131.
Any vehicle suspected of being operated in violation of this part may be the subject of an inspection conducted by an officer of the Georgia State Patrol who has reason to believe such violation is occurring, without the necessity of obtaining a warrant to permit such inspection
 

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Texas

http://http://www.txdps.state.tx.us/vi/inspection/rules_list.asp?itemdrop=Exhaust+System

20.15 Exhaust System. Every motor vehicle shall at all times be equipped with muffler in good working order and in constant operation.

Muffler defined: Muffler is a device consisting of a series of chambers or baffle plates or other mechanical design for the purpose of receiving exhaust gas from an internal combustion engine and/or turbine wheels for the purpose of receiving exhaust gas from a diesel engine, both of which are effective in reducing noise.

The exhaust system includes the manifolds, gaskets, exhaust lines, mufflers, resonators, tailpiping, and supporting hardware.

Motor vehicles cannot be equipped with a muffler which is perforated or which was perforated and has been repaired, either by a muffler repair jacket or by patching or in any other way. In those cases where a muffler is perforated at the time of an inspection or has been perforated and has been repaired previous to the inspection, the muffler must be replaced or the vehicle rejected.

Some pickups are equipped with a camper or hard shell cover and are sometimes used for the transportation of passengers. The tailpipe should discharge the exhaust at the rear or sides. This truck modification will be considered as a passenger compartment.

The entire structure of a motor home-type vehicle is considered a passenger compartment. The cab only of all other truck-type vehicles is considered passenger or luggage compartment.

If the vehicle is equipped with lake pipes or similar devices, such pipes or devices must be securely plated and bolted or capped.

Dual exhaust systems may be modified to single exhaust systems and single exhaust systems to dual exhaust systems, provided the modification does not violate requirements concerning exhaust emission systems.

The catalytic converter will be considered as a part of the exhaust system on all vehicles prior to 1984 year model and will be inspected only visually (if present) for leakage. On 1984 and later model light truck and passenger vehicles, the catalytic converter will be checked for presence and leakage. Flexible tubing which meets the requirements listed below may be used anywhere in the exhaust system.

NOTE: Inspection of exhaust systems covers the discharge of exhaust fumes and is not concerned with the noise level.

1. Inspection Procedure. The exhaust system shall be examined visually while the engine is running to determine efficiency of the system.

2. Inspect for and reject if:

a. Vehicle is not equipped with a muffler.

b. Any joint is loose or leaking, including manifolds. Does not include minor leakage at exhaust control valve (manifold damper or heat riser valve).

c. Manifold is cracked or broken causing leakage.

d. Holes, leaking seams, or patches on the muffler, resonators, exhaust pipe, tailpipe, or catalytic converter.

e. Exhaust system is not secured to the vehicle by mounting brackets designed for exhaust systems (wire is not acceptable).

f. Any brackets are loose, broken, or missing.

g. There is excessive vibration of exhaust line.

h. Any part of the exhaust system passes through the passenger compartment.

i. The tailpipe is broken, pinched, or eroded off to the extent to allow exhaust fumes to penetrate into the interior of the passenger compartment.

j. The tailpipe fails to discharge exhaust from the rear or sides or top of the passenger compartment of the vehicle.

NOTE: Holes in the exhaust system made by the manufacturer for drainage are not cause for rejection. The tailpipe must direct the exhaust fumes out from under the passenger compartment.
 

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COLORADO

title 42 vehicles and traffic : Regulation of vehicles and traffic : Article 4 regulation of vehicles and traffic : Part 2 equipment : 42-4-225. Mufflers - prevention of noise.

42-4-225. Mufflers - prevention of noise.
Statute text
(1) every motor vehicle subject to registration and operated on a highway shall at all times be equipped with an adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise, and no such muffler or exhaust system shall be equipped with a cut-off, bypass, or similar device. No person shall modify the exhaust system of a motor vehicle in a manner which will amplify or increase the noise emitted by the motor of such vehicle above that emitted by the muffler originally installed on the vehicle, and such original muffler shall comply with all of the requirements of this section.

(1.5) any commercial vehicle, as defined in section 42-4-235 (1) (a), subject to registration and operated on a highway, that is equipped with an engine compression brake device is required to have a muffler.

(2) a muffler is a device consisting of a series of chamber or baffle plates or other mechanical design for the purpose of receiving exhaust gas from an internal combustion engine and effective in reducing noise.

(3) any person who violates subsection (1) of this section commits a class b traffic infraction. Any person who violates subsection (1.5) of this section shall, upon conviction, be punished by a fine of five hundred dollars. Fifty percent of any fine for a violation of subsection (1.5) of this section occurring within the corporate limits of a city or town, or within the unincorporated area of a county, shall be transmitted to the treasurer or chief financial officer of said city, town, or county, and the remaining fifty percent shall be transmitted to the state treasurer and credited to the highway users tax fund.

(4) this section shall not apply to electric motor vehicles.

History
source: L. 94: Entire title amended with relocations, p. 2260, § 1, effective january 1, 1995. L. 97: (4) added, p. 393, § 2, effective august 6. L. 2000: (1.5) added and (3) amended, p. 1100, § 1, effective august 2.

Annotations
editor's note: This section was formerly numbered as 42-4-222 and the former section 42-4-225 was relocated to section 42-4-228.

Annotations
annotation

annotations
am. Jur.2d. See 7a am. Jur.2d, automobiles and highway traffic, § 230.

C.j.s. See 60 c.j.s., motor vehicles, § 46.
 

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VIRGINIA:

§ 46.2-1049. Exhaust system in good working order.
No person shall drive and no owner of a vehicle shall permit or allow the operation of any such vehicle on a highway unless it is equipped with an exhaust system in good working order and in constant operation to prevent excessive or unusual levels of noise; provided however, that for motor vehicles, such exhaust system shall be of a type installed as standard factory equipment, or comparable to that designed for use on the particular vehicle as standard factory equipment. An exhaust system shall not be deemed to prevent excessive or unusual noise if it permits the escape of noise in excess of that permitted by the standard factory equipment exhaust system of private passenger motor vehicles or trucks of standard make.
The term "exhaust system," as used in this section, means all the parts of a vehicle through which the exhaust passes after leaving the engine block, including mufflers and other sound dissipative devices.
Chambered pipes are not an effective muffling device to prevent excessive or unusual noise, and any vehicle equipped with chambered pipes shall be deemed in violation of this section.
(Code 1950, § 46-305; 1952, c. 455; 1956, c. 651; 1958, c. 541, § 46.1-301; 1960, c. 120; 1970, c. 266; 1972, c. 66; 1989, c. 727; 2006, cc. 529, 538.)
 

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ARKANSAS

In Arkansas, vehicles are required to have mufflers and it is prohibited to install any kind of exhaust cutout or bypass. AC 27-37-601 and AC 27-37-602.

(dump o2 downpipes are illegal and I have gotten pulled over for it when I had it and gotten a warning as I told the officer it was "broken").
 

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This is a great idea but just remember localities usually have more to ad with local ordinances so check those to.
 

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North Carolina

§NC Code 2005 Statutes 20‑128.� Exhaust system and emissions control devices.

(a)������ No person shall drive a motor vehicle on a highway unless such motor vehicle is equipped with a muffler, or other exhaust system of the type installed at the time of manufacture, in good working order and in constant operation to prevent excessive or unusual noise, annoying smoke and smoke screens.

(b)������ It shall be unlawful to use a "muffler cut‑out" on any motor vehicle upon a highway.

(c)������ No motor vehicle registered in this State that was manufactured after model year 1967 shall be operated in this State unless it is equipped with emissions control devices that were installed on the vehicle at the time the vehicle was manufactured and these devices are properly connected.

(d)������ The requirements of subsection (c) of this section shall not apply if the emissions control devices have been removed for the purpose of converting the motor vehicle to operate on natural or liquefied petroleum gas or other modifications have been made in order to reduce air pollution and these modifications are approved by the Department of Environment and Natural Resources. (1937, c. 407, s. 91; 1971, c. 455, s. 1; 1983, c. 132; 1989, c. 727, s. 9; 1997‑443, s. 11A.119(a); 2000‑134, s. 6.)

*********************************************

NC Counties that Require Emissions OBD Inspections

Inspections, Safety & OBD, are currently required in the following 48 counties:
Alamance
Brunswick
Buncombe
Burke
Cabarrus
Caldwell
Carteret
Catawba
Chatham
Cleveland
Craven
Cumberland
Davidson
Durham
Edgecombe
Forsyth
Franklin
Gaston
Granville
Guilford
Harnett
Haywood
Henderson
Iredell
Johnston
Lee
Lenoir
Lincoln
Mecklenburg
Moore
Nash
New Hanover
Onslow
Orange
Pitt
Randolph
Robeson
Rockingham
Rowan
Rutherford
Stanly
Stokes
Surry
Wake
Wayne
Wilkes
Wilson
Union
 

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Massachusetts


Section 16. No person shall operate a motor vehicle, nor shall any owner of such vehicle permit it to be operated, in or over any way, public or private, whether laid out under authority of law or otherwise, which motor vehicles are prohibited from using, provided notice of such prohibition is conspicuously posted at the entrance to such way. No person shall operate a motor vehicle, nor shall any owner of such vehicle permit it to be operated upon any way, except fire department and fire patrol apparatus, unless such motor vehicle is equipped with a muffler to prevent excessive or unnecessary noise, which muffler is in good working order and in constant operation, and complies with such minimum standards for construction and performance as the registrar may prescribe. No person shall use a muffler cut-out or by-pass. No person shall operate a motor vehicle on any way which motor vehicle is equipped (1) with a muffler from which the baffle plates, screens or other original internal parts have been removed and not replaced; or (2) with an exhaust system which has been modified in a manner which will amplify or increase the noise emitted by the exhaust. No person operating a motor vehicle shall sound a bell, horn or other device, nor in any manner operate such motor vehicle so as to make a harsh, objectionable or unreasonable noise, nor permit to escape from such vehicle smoke or pollutants in such amounts or at such levels as may violate motor vehicle air pollution control regulations adopted under the provisions of chapter one hundred and eleven. No siren shall be mounted upon any motor vehicle except fire apparatus, ambulances, vehicles used in official line of duty by any member of the police or fire fighting forces of the commonwealth or any agency or political subdivision thereof, and vehicles owned by call fire fighters or by persons with police powers and operated in official line of duty, unless authorized by the registrar. No person shall use on or in connection with any motor vehicle a spot light, so called, the rays from which shine more than two feet above the road at a distance of thirty feet from the vehicle, except that such a spot light may be used for the purpose of reading signs, and as an auxiliary light in cases of necessity when the other lights required by law fail to operate.
No person, except a duly authorized person driving an emergency fire vehicle, shall operate a motor vehicle equipped with metal studded tires upon a public way between May the first and November the first; provided, however, the registrar may authorize the use of such tires before November the first, if weather conditions require the use thereof. Whoever violates the provisions of this paragraph shall be punished by a fine of not more than fifty dollars.
 

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Connecticut

Sec. 14-80. Mechanical equipment. (a) Each motor vehicle and the devices on such vehicle shall be operated, equipped, constructed and adjusted to prevent unnecessary or unusual noise.

(b) Each motor vehicle operated by an internal combustion engine shall be equipped, except as hereinafter provided, with a muffler or mufflers designed to prevent excessive, unusual or unnecessary exhaust noise. The muffler or mufflers shall be maintained by the owner in good working order and shall be in use whenever the motor vehicle is operated. No person, including a motor vehicle dealer or repairer or a motorcycle dealer, shall install, and no person shall use, on a motor vehicle, a muffler or mufflers lacking interior baffle plates or other effective muffling devices, a gutted muffler, a muffler cutout or a straight exhaust except when the motor vehicle is operated in a race, contest or demonstration of speed or skill as a public exhibition pursuant to subsection (a) of section 14-164a, or any mechanical device which will amplify the noise emitted by the vehicle. No person, including a motor vehicle dealer or repairer or a motorcycle dealer, shall remove all or part of any muffler on a motor vehicle except to repair or replace the muffler or part for the more effective prevention of noise. No person shall use on the exhaust system or tail pipe of a motor vehicle any extension or device which will cause excessive or unusual noise.

(c) The engine of every motor vehicle shall be equipped and adjusted to prevent excessive fumes or exhaust smoke.

(d) All pipes carrying exhaust gases from the motor shall be constructed of, and maintained with, leak-proof metal. Exhaust pipes shall be directed from the muffler or mufflers toward the rear of the vehicle and shall be approximately parallel with the longitudinal axis of the vehicle and approximately parallel to the surface of the roadway, or shall be directed from the muffler upward to a location above the cab or body of the vehicle so that fumes, gases and smoke are directed away from the occupants of the vehicle. Exhaust pipes on a passenger vehicle shall extend to the extreme rear end of the vehicle's body, not including the bumper and its attachments to the body, or shall be attached to the vehicle in such a way that the exhaust pipes direct the exhaust gases to either side of the vehicle ensuring that fresh ambient air is located under the vehicle at all times. The Commissioner of Motor Vehicles may adopt regulations in accordance with the provisions of chapter 54 to establish safety standards for passenger vehicles equipped with exhaust pipes located in front of the rear axle.

(e) Every motor vehicle shall, when operated on a highway, be equipped with a horn in good working order and capable of emitting sound audible under normal conditions from a distance of not less than two hundred feet, but no horn or other warning device shall emit an unreasonably loud or harsh sound or a whistle.

(f) No vehicle shall be equipped with, nor shall any person use on a vehicle, any siren, whistle or bell as a warning signal device, except as otherwise permitted by this section. Any motor vehicle may be equipped with a theft alarm signal device which is so arranged that it cannot be used by the driver as an ordinary warning signal. Any authorized emergency vehicle may be equipped with a siren, whistle or bell, capable of emitting sound audible under normal conditions from a distance of not less than five hundred feet and of a type approved by the Department of Motor Vehicles. Such signal shall not be used unless the vehicle is operated in response to an emergency call or in the immediate pursuit of an actual or suspected violator of the law, in which event the driver of the vehicle shall sound the signal when reasonably necessary to warn pedestrians and other drivers of the approach of the vehicle.

(g) Any person who violates any provision of this section shall be fined one hundred fifty dollars for each offense.
 

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from the utah state safety inspection manual
SECTION 11 - EXHAUST SYSTEM
• The exhaust system includes the exhaust manifold, catalytic converter, the header
pipe or exhaust pipe, muffler and the tailpipe.
• Exhaust system must extend to the outside of the passenger compartment.
A. EXHAUST SYSTEM
1. Check the manifold, exhaust or header pipe, mufflers, tail pipes and the
supporting hardware.


a.
ADVISE when:

1) Catalytic converter is missing.
b.


REJECT when:

1) Muffler is missing.
2) Exhaust system has any leaks on any part of the system.
(Excluding drain holes installed by the manufacturer).
3) Any part of the system is not securely fastened or secured in
a manner that is likely to fail (i.e., rope securing tail pipe).
4) Tail pipes do not extend beyond the outer periphery of the
passenger compartment or discharges at any point forward of
the passenger compartment or are severely bent or broken.
5) Exhaust system passes through any occupant compartment.
6) Muffler cutout or similar device is installed.
7) Any part of the exhaust system that is located or exposed in a
manner that a person will likely be burned or injured.
8) No part of the exhaust system shall be located that would
likely result in burning, charring or damaging the electrical
wiring, the fuel supply or any combustible part of the motor
vehicle.
*


NOTE: After Market Muffler Devices: (UCA 41-6a-1626(b)). Every motor

vehicle shall at all times be equipped with a muffler or other effective
noise suppression system in good working order and in constant
operation. A person may not use a muffler cut-out, bypass, or similar
device. Excessive or unusual noise is prohibited. (Additional noise


ordinances may be enforced by a city and/or county).

Title 41
Motor Vehicles
Chapter 6a
Traffic Code
Section 1626
Mufflers -- Prevention of noise, smoke, and fumes -- Air pollution control devices.
41-6a-1626. Mufflers -- Prevention of noise, smoke, and fumes -- Air pollution control devices.
(1) (a) A vehicle shall be equipped, maintained, and operated to prevent excessive or unusual noise.
(b) A motor vehicle shall be equipped with a muffler or other effective noise suppressing system in good working order and in constant operation.
(c) A person may not use a muffler cut-out, bypass, or similar device on a vehicle.
(2) (a) Except while the engine is being warmed to the recommended operating temperature, the engine and power mechanism of a:
(i) gasoline-powered motor vehicle may not emit visible contaminants during operation;
(ii) diesel engine manufactured on or after January 1, 1973, may not emit visible contaminants of a shade or density darker than 20% opacity; and
(iii) diesel engine manufactured before January 1, 1973, may not emit visible contaminants of a shade or density darker than 40% opacity.
(b) A person who violates the provisions of Subsection (2)(a) is guilty of a class C misdemeanor.
(3) (a) A motor vehicle equipped by a manufacturer with air pollution control devices shall maintain the devices in good working order and in constant operation.
(b) For purposes of the first sale of a vehicle at retail, an air pollution control device may be substituted for the manufacturer's original device if the substituted device is at least as effective in the reduction of emissions from the vehicle motor as the air pollution control device furnished by the manufacturer of the vehicle as standard equipment for the same vehicle class.
(c) A person who renders inoperable an air pollution control device on a motor vehicle is guilty of a class B misdemeanor.
(4) Subsection (3) does not apply to a motor vehicle altered and modified to use clean fuel, as defined under Section 59-13-102, when the emissions from the modified or altered motor vehicle are at levels that comply with existing state or federal standards for the emission of pollutants from a motor vehicle of the same class.
Renumbered and Amended by Chapter 2, 2005 General Session

the red line is up to the officer's discretion unfortunately.
 

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New Hampshire

266:59 Muffler; Prevention of Noise. –
I. Every motor vehicle shall at all times be equipped with a muffler as defined in RSA 259:66, in good working order and in constant operation to prevent excessive or unusual noise, and no person shall use a muffler cutout, bypass or similar device upon a motor vehicle on a way.

II. The engine and power mechanism of every motor vehicle shall be so equipped and adjusted as to prevent the escape of excessive fumes, smoke, flame, gas, oil or fuel residue.

III. [Repealed.] (Used to say that any modified exhaust couldn't be louder than stock and that stock exhausts had to comply with these regulations.)

IV. No person shall operate a motor vehicle with a straight pipe exhaust system; "straight pipe exhaust system'' means any straight- through exhaust system that does not contain baffles or otherwise does not meet the definition of muffler in RSA 259:66. Any person who violates the provisions of this paragraph shall be guilty of a violation and shall be fined not less than $100 for a first offense, not less than $250 for a second offense in a calendar year, and not less than $500 for a third or subsequent offense in a calendar year.

259:66 Muffler. – "Muffler'' shall mean a device consisting of a series of chambers or baffle plates or other mechanical design for the purpose of receiving exhaust gases and effectively reducing noise.
 
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