I'm considering adding hi-flow cats to my stillen exhaust (probably the crawford hi-flow cats). Does anyone have experience with what the changes in sound would be? I'm wondering from a total loudness factor as well as the qualitative aspect (how does it sound?).

 

Hi their George. GurgenPB has the Stillen on his sedan and he's had two different high flow cats on it if I recall, Crawfords is one of them I do believe

Here's a link to his profile so you can pm him.
https://g35driver.com/forums/members/2974-gurgenpb.html

 

Hey Jim! Happy holidays to you.

Do you know if GurgenPB added the cats before adding his exhaust or after?

I'm pretty sure you added your cats after as well - right? Did that change the sound at all?

 

I'm positive he added his cats after he installed the exhaust. My high flow cats were part of my custom exhaust from the start, I've never run the current system without them.