I just had my Greddy exhaust put on my sedan, and it definitely revs much nicer through the whole rpm range. Also sounds good, not ricey at all, pretty mellow and sporty.

The Greddy system was definitely worth it, the butt-dyno says at least 10+ h.p. If definitely made up or actually exceeded my expectations for the oompf I lost with the 20's. Only complaint is the tip is kinda big, a little rice, but oh well, its not too noticeable.

I've been seeing all the stuff about loosing the gains. Please advise if I should "reset" the ecu, how, and when I should do this if at all.