Ok I know this is an exhaust question and the exhuast forum is there, problem is they don't have the turbos like we do, so the opinions I would get from there would be somewhat a guessing game. Now on all the turbo cars I deal with here we are using upwards of a 3 inch exhaust and these are for lilttle 2.0's and 3.0's. If you bring the exhaust out of the turbos into a 3 inch downpipe/y-pipe configuration where would it be best in the configuration to step it up to a 4 inch? directly after the cross of the y-pipe or 12-14" behind it where the cat normally would be? I have looked at the way the stock system routes and I have a rear muffler setup similar to a corvettes configuration I will be using out back, just trying to get the flow figured out. Looking at flowing 2 TO4E's on this one so I need some ideas here, and taking it to the local muffler shop for a custom job is out of the question. The charge would be upwards of $600 here in japan.


TC

 

Where the hell have you been? Be sure and email tonight on getting you your stuff...........Not that I'm running the best thing possible but mine is a street car........I'm running the Mufflex 3" y-pipe into the 4" single intermediate into dual 3" outlets. Oh yeah, the 3" down pipes go into the 3" y-pipe from mufflex.

 

I understand your wanting to run twins,and I don't know if your planning to run them into a single or not but ATR makes some sweet exhasts and mufflers,designed from the start to work with turbo's and they have a single 3" for thirdgen f-cars that has gone 9.50's on a sungle turbo stage 2 TTA.

The only thing I can tell you is to avoid flowmasters,scince they are designed to work well with a pulsing exhaust where turbo's have a streaming exhaust and flows have been found to slow down GN's

HTH,
Steve