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Discussion Starter · #1 ·
Was thinking of getting rid of my Cobb test pipe with HFC and replacing with the tomei straight test pipe to go along with my tomei CBE, but have been hearing that losing HFC will cause me to lose some low end tq. Is this the case? Thanks.
 

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[Team IEG VP]
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Actually it will. A little bit, but nothing much to notice. The difference between the HFC and straight test pipe is going to be maybe a couple HP and TQ.
 

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Discussion Starter · #4 ·
So goin straight pipe is more about sound than performance?
 

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No.. It's more of a trade off, letting the car breathe more via tp will give a couple hp but you will lose some tq. It's a very very small amount though.
 

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not really because its minimal and very minimal at that... he is thinking it is enough to be like OMG my car has no power, in the end the TP makes up for more then the minimal loss
 

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not really because its minimal and very minimal at that... he is thinking it is enough to be like OMG my car has no power, in the end the TP makes up for more then the minimal loss
well you said its negative, he does losses trq. Yeah he wont even notice it but you got to answer the question correct.
 

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Was thinking of getting rid of my Cobb test pipe with HFC and replacing with the tomei straight test pipe to go along with my tomei CBE, but have been hearing that losing HFC will cause me to lose some low end tq. Is this the case? Thanks.
Sequence he didnt ask if he would feel any difference, his asking if he will lose low end tq by switching hfc to testpipe. Yes its minimal but he will lose some.
 

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Discussion Starter · #13 ·
Nothing a little boost or timing can't fix ;-)
 

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How about the statement that no butt dyno anywhere would be able to tell the difference between an HFC and a TP. it's at best 3-5 hp up top.

IMO the performance difference isn't a reason to go one or the other. More comes down to personal taste (test pipe will be louder) and budget.
 

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well if you the the hfc off you might lose a little torque, but with testpipe will gain top end hp.

hmmmm maybe i should get a HFC:)...lol
 

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What the hell...does anyone understand exhaust flow? We're talking about taking out the high flow cat, and putting in a straight test pipe, correct? And we think you're going to lose torque? Sure, the high flow cat flows very well compared to the stock cat, but there is still some restriction there. When you get rid of that, you get rid of the backpressure and add velocity to the exhaust, since it doesn't have to slow down through the cat.

When you reduce backpressure and gain velocity, you gain TQ and HP everywhere...low, mid, and top end, plus the turbo can spool faster with that lower backpressure.

Now, is the difference going to be huge? Will you be able to feel it? Probably not, but there are only gains to be had...you won't lose anything.

You're taking this large brick out...




...and putting this free flowing pipe in.

 

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^^ That.
On turbo cars, less exhaust restriction = tq and hp gains every time. I fail to see by what mechanism you could possibly lose torque by adding a test pipe on a turbo car. That whole "you need some backpressure" mantra does not apply to our cars, afaik.
 
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