Quote:
Originally Posted by vstolpner
Does that do anything for performance or sound?
I don't imagine the designers would have introduced a flap unnecessarily...
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Your car will be
slightly louder on startup and at part throttle. Still very quiet overall though. You won't even really notice it driving around , but you'll notice it on startup.
There are literally eleven thousand videos of it on youtube. Extremely common "mod".
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'02 S54 M3 (500/500 GC/Koni)
'08 N54 135 (JB4, DCI, BMW PS/Bilstein B6s, H&R M3 FSB, Strongflex FCABs)
'14 N55 X1 (JB4, BMS DP, BMS Intake, Alpina TCU reflash, H&R Sports, Bilstein B6s, E93 M3 RSB, Strongflex FCABs, baby seat)
'08 N54 535xi touring (Bilstein B6s, Downpipes, MHD tune, baby seat)