I got a super 40 series put on my V6 stang.. all i did was replace the muffler for now... and imo it sounds close to a v8 when i rev it... at idle and inside iits quiet but on the road it sounds good...
just got catback true duals with super 40s done last friday...i think they sound great, nice and deep. i will try to post a soundclip sometime this weekend.