Will your Bimmer be louder in the cabin...yes, but in most cases it will be totally acceptable.
I really like the way my Magnaflow catback exhaust sounds.
HP, if you install headers with your full exhaust, you will pick up usable WHP that you
Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
SUMMIT POINT WV 1:24:229 S.C.C.A.
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"
NEW E46 Xi COILOVERS DISCOVERED FOR ~$749 !!!
Originally Posted by RacerX
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!