"Bolts directly to your stock catalytic converter. Note: This system will NOT work with the TurboXS downpipe and cat/mid-pipe. It is designed for the stock downpipe/cat section"

This really sucks maens cuz the TurboXS downpipe just so happens to be the DP i was about to get but i dont think this is true if anybody can give me any information going against this like someone that has the Blitz NUR spec with an aftermarket down. oh yea i got this info from www.fastwrx.com

 

doesn't work with the TurboXS. I have a Godspeed downpipe and the Blitz NurSpec Racing catback. No cel with the downpipe, period. And that's without having to buy an additional "fix".

San

 

If you have not bought parts yet....get a Turbo XS stealth back and a blitz nur spec axle back...bolts up real nice and plus TX-s is great quality....

all for relatively the same price but better DP....

 

massive hp, the downpipe will not be the restriction. Dan from Godspeed had 390 whp from a WRX with the same downpipe. I doubt you'll be reaching this level soon. As stated before, no cel with this downpipe. Not sure if TurboXS needs a fix. My $0.02, mileage varies.

San

 

You can always consider Helix. I've heard plenty of good reviews on it.

 

I think Turboxs is selling their downpipe with a catback adapter pipe so you can use it with an aftermarket exhaust.

 

Helix has a bellmouth, but I think the only argument is the torque at low rpm with a smaller tubing. But if you're lookin' to push hard, I'd go Helix DP since it's a full bellmouth and lets all the air just go straight through.