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      10-23-2012, 09:27 PM   #3
First Lieutenant

Drives: F30 328i, AP1 S2000
Join Date: Sep 2012
Location: Longmont, CO

Posts: 319
iTrader: (0)

To force the exhaust flap open for a louder exhaust note. Stand outside your car while somebody starts it - you'll hear it loud at first, then a clang as the flat closes and the exhaust'll be much quieter. The noise doesn't seem to make it into the cabin much, though.