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      03-21-2010, 10:04 PM   #153
TreDirtyFive
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Drives: X3 M40i
Join Date: Jun 2008
Location: Los Angeles, CA

iTrader: (10)

This mod is known to have reduced driving mileage and the lack of back pressure with the pipes fully open loses a tad of torque down low. I did it on my 335i and that was exactly the case. Mileage got horrible and there was some highway droning at 3K. I does sounds nice at startup though! Stays loud without one flap closing.
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X3 M40i G01, M235i F22, 335 F30 MSport, 135 DCT, 335 E92, Audi A3