Constant exhaust leak after HFC install - EvoXForums.com - Mitsubishi Lancer Evolution X Forums
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Old 11-01-2018, 03:39 PM   #1
llllBULLSEYE
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Constant exhaust leak after HFC install

Ok So I have tried every single gasket combination and I still keep getting an exhaust leak which can I can only hear at low rpms.
Last thing I tried was the ETS flange adapter with a 2.5" Remflex gasket on one side and 3.0" remflex gasket on the other. Leak got louder.
Also I just notice this, but the part where the exhaust connects to the HFC is at an angle. Is this normal or could this be the issue.
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Old 11-01-2018, 03:41 PM   #2
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Also at first I had the Vibrant 3" gaskets and it did not leak until a week later.
I then switched to Grimspeed thick gaskets and leaked right away.
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Old 11-01-2018, 07:07 PM   #3
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Lol yes that angle is definitely not normal. It should be flat against the car, I've never seen an exhaust sag that much.

Check that rubber exhaust mount on your HFC - if it's old and saggy it will cause problems.

Or, wait, is your HFC actually angled past the actual CAT? It doesn't look like it's bending at the downpipe flange.
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Chris Carbee Tuned on Tephra v3, making 400 horsepower to all four wheels, because that's the only place power should ever be.

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Old 11-01-2018, 08:07 PM   #4
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That angle is really messed up. What catback exhaust is that? Are you missing a hanger or have the pipe rotated 180 degrees?
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Old 11-01-2018, 08:22 PM   #5
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Do you have a Q300 by any chance? Because the first time I installed mine I installed it upside down. It didn't sag like this but there was a nasty exhaust leak because of it.
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Chris Carbee Tuned on Tephra v3, making 400 horsepower to all four wheels, because that's the only place power should ever be.

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Old 11-02-2018, 10:28 AM   #6
Cheshire Cynic
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Based on the stock exhaust, it looks like the mount is on the right (both direction and correct) side, but that angle is extremely off... it should run straight back off the cat, flat against the car (really close to the driveshaft, but not close enough to ever touch)
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Old 11-02-2018, 07:19 PM   #7
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ok thanks for confirming guys. I knew it didn't look right.
The muffler shop said it looked fine.

The exhaust is Circuit Werks which my friend has and I just checked this morning and it aligns perfect to the stock cat. The HFC is Turbo XS I dunno I got this for $45 from a guy maybe he sold it cheap cause he had the same problem.

AiZ The rubber mount is good. The pipe being upside down that could be it. Im going to see if flipping the midpipe will make a difference.
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Old 11-02-2018, 07:22 PM   #8
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This is a pic from the first day when It wasn't leaking.
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Old 11-02-2018, 09:47 PM   #9
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Yeah based on that picture, from this angle it definitely looks like your CAT pipe is either bent or at a weird angle. The whole of the cat and midpipe should fit within the groove on the underside of the car, where the heat shields are.

Check the mounting bracket on the rear portion of the exhaust too, if flipping that mid-pipe doesn't help. Hard to see if the mounting rubber is even in place, and looks to me like it's a single exit right?
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Chris Carbee Tuned on Tephra v3, making 400 horsepower to all four wheels, because that's the only place power should ever be.

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Old 11-07-2018, 06:59 PM   #10
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Well I put it up on a lift and found the mount was bad so you were right. I did manage to make the mount hold it in place. I flipped the mid pipe and Unfortunately the turbo XS HFC will not bolt on to the midpipeClick image for larger version

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