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Old 12-06-2012, 03:07 AM   #6
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Join Date: Sep 2011
Location: OC,CA
Posts: 4
My Ride: 02 Bmw 325ci
They are all mostly for sound unless you are talking about changing the whole exhaust system. No really big difference in hp gain if you will just change the muffler.
Anyone can correct me if i'm wrong ?

Last edited by 325bmwforlife; 12-06-2012 at 03:07 AM.
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