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Old 07-14-2019, 07:32 PM   #1
2016WRXguy
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Default Tomei TI Catback exhaust Slight Air Leak

Hello Everyone, this is my first time posting something and I can use some help with a issue I'm having. I just installed my Tomei Ti catback exhaust on my 2016 WRX. After I installed it and started the car, I felt and heard a slight air leak around the clamps just past the mid pipe. I tried re tightening the clamps and still there was a tiny air leak. Ive driven the car about 30 miles since the install and have NOT had any problems, however this leak does concern me. Has this happen to anyone else? is this a serious problem? should I take my car in to a professional?

Thank you.
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Old 07-14-2019, 08:38 PM   #2
gunz4me
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While researching which single exit exhaust to go with, the clamps on the Tomei seem to be the major drawback to that particular titanium exhaust. As a result, I'm going with the Invidia Titanium exhaust when the funds are available.
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Old 07-14-2019, 08:48 PM   #3
carsebuco
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Quote:
Originally Posted by 2016WRXguy View Post
Hello Everyone, this is my first time posting something and I can use some help with a issue I'm having. I just installed my Tomei Ti catback exhaust on my 2016 WRX. After I installed it and started the car, I felt and heard a slight air leak around the clamps just past the mid pipe. I tried re tightening the clamps and still there was a tiny air leak. Ive driven the car about 30 miles since the install and have NOT had any problems, however this leak does concern me. Has this happen to anyone else? is this a serious problem? should I take my car in to a professional?

Thank you.
If all your parameters are fine, physically check for leaks again and there still is, I'd try to seat the exhaust again before taking it to a professional. If you do not have an ap and cannot monitor the data, however, and you do feel a leak, I'd take it to get it "fixed."
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Old 07-14-2019, 10:07 PM   #4
2016WRXguy
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I do have a AP and havent had any bad readings. Ill take your advise by refitting the exhaust. Im planning on getting a dyno tune since im getting a downpipe as well and dont want any leak since it could hinder my readings, even though the cars seems to run ok. thank you

Anyone else have more insight?
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Old 07-15-2019, 07:24 AM   #5
bdubblu
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Get better clamps. Two things to look for. Clamp type and width.

Iím looking at the TI and it looks like they come with t-bolts. Thatís an awful choice for the clamping power you need at a slip joint.

Get a couple of these:
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Old 07-15-2019, 07:40 AM   #6
Turpid Porpoise
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Look into Mikolar clamps, way stronger than T-Bolts and I've found they have better clamping than the band clamps posted above.
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Old 07-15-2019, 11:59 AM   #7
raisingAnarchy
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I've got the same issue. The provided clamps don't have even clamping force, which has been my experience for any band clamp any where else on the car. I've noticed some improvement with rotating the exhaust pipes, but it's been sometime since I've played with it. I still have an annoying exhaust leak at the two slip joints, though the flange to the catalytic converter is perfectly sealed.

My fuel trims are perfect though. If the leak is post-cat, then all you're going to get is some noise. It shouldn't really affect performance. I've also heard of people putting serious heat into the system to get it to seal up. I have yet to take the exhaust on track so tbd on that concept for me.
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Old 07-15-2019, 07:22 PM   #8
2016WRXguy
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Thank you for all the feedback. Its been very helpful knowing that people actually take time to help others on these forums. I will take the advise and look into new clamps. I did realize the clamps that are provided do not provide an even seal. My only concern (like I said in the previous comment) is since i plan to get a catted Jpipe and Dyno tune, i hope this leak (if still present) will not affect my dyno readings.

Thank you

Im still open to more input from others.
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Old 07-15-2019, 09:29 PM   #9
2016WRXguy
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Quote:
Originally Posted by bdubblu View Post
Get better clamps. Two things to look for. Clamp type and width.

Iím looking at the TI and it looks like they come with t-bolts. Thatís an awful choice for the clamping power you need at a slip joint.

Get a couple of these:
What type of clamp and width is that one you posted?

Thank you.
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Old 07-16-2019, 11:58 AM   #10
bdubblu
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Quote:
Originally Posted by Turpid Porpoise View Post
Look into Mikolar clamps, way stronger than T-Bolts and I've found they have better clamping than the band clamps posted above.

I dunno... the only high pressure clamp from Mikolar is a T-Bolt setup. That's essentially what comes with the TI exhaust already. Unless you provide a link to something I'm not seeing, the exhaust clamps I show above tend to be better with slip joints. You can get them wider, they tend to be thicker gauge than the t-bolt and when you hit them with a gun, it's 100% seal every time. Never had a leak from one.
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Old 07-16-2019, 12:08 PM   #11
bdubblu
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Quote:
Originally Posted by 2016WRXguy View Post
What type of clamp and width is that one you posted?

Thank you.
Here's an example of a 1.25" wide exhaust clamp in the type I posted above.
https://www.amazon.com/Torca-AccuSea...omotive&sr=1-1

There's also this "lap band" style which encloses the joint entirely:
https://www.amazon.com/TOTALFLOW-TF-...motive&sr=1-10
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