catbacks on the rx8 are a lot of money for 3-4 hp...

yeah, if that. although some of them do sound better

I'm runing the Greddy SP2, it's damn near as quiet as stock at idle. Gets a little volume as you give it gas, has a deep sound, but never gets really loud ie. the cops won't be bothering you. All in all I really like it. It's also all Stainless Steel and won't rust like the stock POS...

i just got done with porting/rebuilding an rx8 with a midpipe and whatever aftermarket catback...you STILL can't hear the motor on the freeway with the windows down, unless you're on it pretty good.

I have the RB catback and love it. Also, changing out my exhaust hasn't effected my warranty.... my dealership said "no problem since it's catback".

yea, they say that until you take it in for a warranty claim. https://www.nopistons.com/forums/pub...DIR#>/wink.png

I just got it back from them with a warranty claim.... no probs. https://www.nopistons.com/forums/pub...IR#>/smile.png The service dept at the dealership here is really very cool.... or maybe it's just me. (kidding!)