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      08-02-2013, 02:21 PM   #7
gibumee
Private First Class
 
Drives: 335i N55 PPK
Join Date: Jun 2013
Location: Chicago, IL

Posts: 114
iTrader: (1)

mileage seems same. i think it leaves the exhaust valves open but it def sounds louder and the burble in intoxicating. i think the sounds make the car feel faster
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