View Single Post
      10-23-2012, 09:27 PM   #3
elistan
First Lieutenant
United_States
3
Rep
319
Posts

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

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.