[LennoxConner]

So I read on phatbotti tuning that catted is the way to go. So is this only relating to the j pipe? Or is i t relating to a catback exhaust system too. I’m kind of confused on this boost creep stuff, and I’m new to all the tuning cars 9Apps – Download 9Apps Free Fast Install for Android 2020 stuff too. All I have is axle back muffler deletes on my car now. Solitaire

 

[eyebuck108]

The catalytic converter is in the downpipe. Catback means "back from the catalytic converter." There is no cat behind the downpipe, so it's irrelevant to catback exhaust systems. Use of a catted downpipe will negate the issue of boost creep.
And any aftermarket downpipe will require a new ECU map or "tune." My WRX is tuned by Ron Watson (Phatbotti) with a catted downpipe. No one is better than Ron when it comes to tuning. I've used several others over the last 15 years, but Ron is the best I've experienced.

 

[LiL Shoaf]

EyeBuck is correct. The Catalytic Converter is located in the J Pipe. I opted for a Catted J Pipe and Resonated Mid Pipe for My17 build.