[Gopher XT]

I recently bought a used stealthback and matted it up to an STI axleback. I really love the grumble and the stage two power! (unfortunately now i scour the forums for turbos and inter-coolers) I noticed that under load, the exhaust makes an exaggerated sound (like a hiss). I can not discern if it is a leak, or just the sound of the system. I think there might be a leak at the cat back donut flange. Below is a picture of the set up now:

As you can see the donut flange is not completely covered. I tried tightening the flange last night, but it would just spin (i was holding both ends). Another thing that concerns me is the springs are not fully compressed. Interestingly enough, I also could not loosen the spring-loaded bolt. Did I mess something up when I installed, or does this look correct?

 

[Gopher XT]

Can anyone with a stealthback climb under their car and see if their donut gasket looks like it is seated similarly? I would greatly appreciate it.

 

[lh0628]

Did you strip the bolt if you can't tighten/loosen it?

My stock pipe looks kind of like that. When I had it off the car, if I lift by one end, the spring loaded part would bend and I can see the donut gasket move around in there.

Sorry I'm not much help.

 

[Canonshooter]

It may be that your TXS DP/midpipe connection is supposed to use a flat gasket as opposed to the donut. Check with TXS to confirm...

 

[Gopher XT]

I sent TurboXS an email, and they said it is the stock muffler noise which is common. I guess since the resonator has been eliminated it makes extra noise.

 

[08vtwrx]

I would loose the donut gasket and use a flat one to ensure a tight seal. I did away with the spring bolts when I installed my invidia on my wrx and had no problems.

 

[Gopher XT]

I would loose the donut gasket and use a flat one to ensure a tight seal. I did away with the spring bolts when I installed my invidia on my wrx and had no problems.

What are the disadvantages of loosing the spring bolt?

 

[ScoobyDoobie]

Is the TXS full 3" at the DP/mid pipe connection? Or does it taper down like the Cobb DP?

If that's a full 3" connection, do as others have said put a flat flange gasket in there.

 

[Gopher XT]

After the cat I believe it is still a 3" connection, but it tapers in the midpipe from 3" to 2.5 inches.

 

[funkymonkey1002]

How you have it setup now is correct and should work alright. That flange setup is designed to use a donut gasket, it won't work at all with a flat gasket.