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Old 03-20-2013, 08:05 AM
Bob Z. Bob Z. is offline
Registered User
Location: Palm Coast FL 32137
Join Date: Aug 2012
Posts: 94
Mein Auto: 2013 135i Convertible
As per a couple questions, the cat-back exhaust does not add any horsepower as far as I know, maybe a few but I did not notice any difference. It was added just for an improved sound since the car is really quiet with the stock exhaust, which I still have so someone could put back on if they wanted to.