Test pipe vs cat

[fregisr]

So I got tired of that strong smelly fumes coming out of my pipe and decided to put the cat back in. Boy I can feel the difference. Had any body actually have a dyno on how much gain is testpipe over the cat. Stock t25, FMIC, KNN intake, walbro fp, 11~13psi?

[Neil]

dunno the answer to your question, but are you now running a hi-flow or the stock cat?

ive still got the stock cat and I wanna know what its like rockin catless

[fregisr]

I have the oem cat now. With test pipe, you can feel the difference, just don't know how much. The turbo use to just spool real quickly from 1.8k rpm all the way to red line.

[808DRFTR]

Won't see no major gains, better spool though. Get a high flow cat if your daily driving it.

[Nismo_Freak]

It's about a 5 - 8whp difference on the OEM cat.

The high flows make it a 1 - 2 whp gap.