BMW M3 and BMW M4 Forum - View Single Post - Exhaust system database for the M3 and M4!

neo871 · 02-05-2015, 07:55 AM

Can anyone tell me if most of the aftermarket exhausts use a stock-like bypass valve system or a single mode regardless of what driving mode you're in (eff, sp or sp+)?

02-05-2015, 07:55 AM	#148
neo871 Major 142 Rep 1,399 Posts Drives: 340i xDrive MPPSK Join Date: Jul 2005 Location: Bucharest, Romania iTrader: (0)	Can anyone tell me if most of the aftermarket exhausts use a stock-like bypass valve system or a single mode regardless of what driving mode you're in (eff, sp or sp+)?
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