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bfrancis827
02-02-2008, 05:34 PM
I have an '07 STI and Cobb TBE exhaust. The other day I was driving and it sounded like the exhaust was coming from under the car. I have noticed this once or twice before but it always went away and I never found a leak. This time when I looked under the car I could see where is was leaking from. Where the downpipe connect to the mid pipe there is a leak. The bolts are tight and the flanges are touching where the bolts go through, but it starts to open up in between the bolts. What could have caused this and what can I do to fix it?
http://ims.hspn.com/pic.php?u=246C584L&i=4103
newbie101
02-02-2008, 05:51 PM
is there a gasket in there?
Blix666
02-02-2008, 05:51 PM
is there a gasket in there?

that's what i was gonna say...it doesn't appear that there is...
newbie101
02-02-2008, 06:20 PM
ya it dosnt look like one is there...i would start there
BlackParis
02-02-2008, 07:18 PM
there is also a Larger size donut gasket that you can buy... I bought a 3inch Catback and had to buy the larger donut because my stock donut fell inside the flange.. looked similar to yours....
sebhockey
02-03-2008, 12:50 AM
+1 on a gasket to start. It looks like something might have hit part of the exhuast to cause that. You can try straightening the rear flange first, but definately put a gasket in there.
VermillionX
02-04-2008, 08:25 AM
Thats what I had to do with mine. The only difference is I had a large leak.
bfrancis827
02-04-2008, 09:57 AM
I will get a gasket. Thanks for the help everyone. When I was installing it I thought there should have been a gasket there, but there was only one in the kit and it said to put it in between the mid pipe and the muffler. ??
BlackParis
02-04-2008, 02:35 PM
http://www.monstermarketplace.com/Automotive/Landing1723a1267.html

this gasket....
bfrancis827
02-08-2008, 11:15 AM
http://www.monstermarketplace.com/Automotive/Landing1723a1267.html

this gasket....

How does that gasket work? Does it go on the inside? Kinda looks like a coupler.
Corruptmotors.com
02-08-2008, 02:51 PM
http://www.grimmspeed.com/store/index.php

buy from a sponsor :)
I Like It Sideways
02-08-2008, 03:17 PM
http://www.grimmspeed.com/store/index.php

buy from a sponsor :)

+1!!
http://www.zoto.com/ilikeitsideways/img/45/494c6fff72a8bfa2d65979884f8051b5.jpg

Good n' thick.
bfrancis827
02-08-2008, 05:33 PM
http://www.monstermarketplace.com/Automotive/Landing1723a1267.html

this gasket....

After I saw a picture of this gasket it hit me. I thought the gasket was flat so that is what I was looking for. Turns out I have had the gasket all along. It was still on the end of my stock downpipe. When I was removing the stock exhaust and installing the Cobb TBE I had thought that this thing was attached to the stock downpipe and didn't even think it was a gasket.

So it's fixed. I have to admit that it sounded better with the leak. lol

Gasket:

http://ims.hspn.com/pic.php?u=246C584L&i=4182

Where it came from (stock downpipe):

http://ims.hspn.com/pic.php?u=246C584L&i=4183

Where it is supposed to go:

http://ims.hspn.com/pic.php?u=246C584L&i=4184


Thanks for everyone's help!!!
RS-ti_Andy
02-08-2008, 06:19 PM
glad it worked out.. i was going to mention that lol, i did it on my scion exhaust
sebhockey
02-08-2008, 09:28 PM
Nice job fixing and finding your problem, and for free none the less.
bfrancis827
02-14-2008, 10:51 AM
Nice job fixing and finding your problem, and for free none the less.

Thanks. Yeah free fix FTW!
BlackParis
02-14-2008, 02:09 PM
rofls...

I am amazed you got it off in one piece... Of course you don't live in the North east.... Salted roads FTL....
brd360sk8
02-14-2008, 02:40 PM
I hate those stupid spring bolts! The flanges on my Tanabe catback are super thick! So i had to push so freakin hard to get it come thru the other side. Took about an hour or so haha.
bfrancis827
02-15-2008, 01:13 AM
rofls...

I am amazed you got it off in one piece... Of course you don't live in the North east.... Salted roads FTL....

I didn't have to many miles on the exhaust so it was pretty easy. Didn't even have the use the break away spray stuff.
BlackParis
02-15-2008, 09:10 AM
I hate those stupid spring bolts! The flanges on my Tanabe catback are super thick! So i had to push so freakin hard to get it come thru the other side. Took about an hour or so haha.

I bought a longer set from a ford ranger... bvut mainly because my threads were completely rusted away/non existant in 1 year...
409industries
02-22-2008, 09:33 PM
stoked that you got it fixed! whenever possible you should use new gaskets because they crush to make a good seal.

Those spring bolts suck so much ass, i broke both on the RS. stupid POS.
VMethos
03-07-2008, 08:51 AM
I am amazed you got it off in one piece... Of course you don't live in the North east.... Salted roads FTL....

Tell me about it...
When I put in my new downpipe I broke both spring bolts (even drenching it in PB Blaster) and the donut flange kind of flaked apart.

My friend and I made our own flange with that high heat resistant liquid silicon stuff, but when I change my catback I'll probably go and order one of those donut flanges now that I know where to find them.