Originally Posted by Onelownismo

Resonated high flow cats? (I'm asking if thats what your abbreviation was)

All I can say is when I had my non-res test pipes and my non-res FI catback, it was LOUD. I absolutely loved it though.

Only reason i went and got HFC's was A) to pass inspection and B) to quiet down since it was my daily.

But now since I have another daily, I'm thinking about going back to test pipes and perhaps z1 headers.