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Old 08-21-2017, 01:36 AM   #1
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Default FM 2.5 Exhaust Gaskets

Sorry in advance for the annoying questions but....

For those of you that used the FM 2.5 turbo exhaust setup, which gaskets did you use? I grabbed a random one from autozone when I installed things months ago and it seems to be leaking now... I had called FM at the time and they told me to just use whatever was the right diameter, but I don't think that it should be leaking already. I'm trying to go through and replace everything just to see if I can get rid of this exhaust leak.
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Old 08-21-2017, 01:40 AM   #2
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Where is it leaking at?
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Old 08-21-2017, 02:37 PM   #3
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Looks like a V-band clamp was a bit loose so I tightened that and put in a little blue loc-tite to hold it there.

I used a piece of rubber pipe to listen around for leaks and surprisingly the exhaust gaskets weren't all that bad. I did hear quite a bit of air leaking at the exhaust manifold though, which is annoying since those bolts are a ******* pain to get to. I hope the manifold or exhaust gasket there didn't warp somehow.
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Old 08-22-2017, 07:14 PM   #4
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I use the 3" exhaust, FM told me to use Permatex Ulta copper RTV:

https://www.permatex.com/products/ga...-gasket-maker/

Good luck.
Ben.
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Old 08-22-2017, 08:17 PM   #5
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I've had no luck finding gaskets locally , the bolt spacing seems to be some weird spec . The universal ones I used that were "close " lasted a couple of months. In the end I just ordered a half dozen from FM with my last order. Easier just to stock a few. And that's the train of thought that enables you to have a house that's swamped in Miata spares....
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Old 08-22-2017, 10:01 PM   #6
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The FM 3" exhaust that I have was made by Thermal, and they appear to have used Vibrant stainless flanges. Summit sells gaskets for them.

--Ian
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Old 08-23-2017, 09:29 AM   #7
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I have used red gasket maker on all my normal flanged exhausts for as long as I can remember. It always seemed to work better then real gaskets for me. Just let it dry for a bit before you start up the car.
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Old 08-23-2017, 12:08 PM   #8
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Sounds good! Thanks guys. On further inspection, i.e. getting under the car with it running for a minute. I used a pipe to listen around and the gaskets weren't all that bad. The V-band had a bit of a exhaust leak and I heard a bit of leak coming from the manifold... I'll see if I can tighten it up a bit. I'd be shocked if it warped!
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Old 09-12-2017, 11:44 PM   #9
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Quote:
Originally Posted by ridethecliche View Post
Sounds good! Thanks guys. On further inspection, i.e. getting under the car with it running for a minute. I used a pipe to listen around and the gaskets weren't all that bad. The V-band had a bit of a exhaust leak and I heard a bit of leak coming from the manifold... I'll see if I can tighten it up a bit. I'd be shocked if it warped!
The bolts have most likely loosened with heat cycling/vibration. Tighten down the manifold bolts.
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