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On 35i when you flash the car with a tune and up the boost you do sometimes hear turbos spooling up. And with a dual cone intake its even more obvious.
Maybe it has a tune on it?
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2009 35i DCT Havana brown with ivory white interior. Mods: Cobb stage 1+FMIC, Wagner EVO1 FMIC, BMS DCI, KW V3 suspension, M3 front control arms, Hardrace RTAB, Michelin Pilot Sport 4S tires.
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