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      01-27-2014, 12:41 AM   #190
Sir Loin
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Drives: Silverstone F80 M3
Join Date: Aug 2013
Location: Seattle

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From the spec thread:
http://f80.bimmerpost.com/forums/sho...d.php?t=923203

Quote:
•Electronically control Exhaust
  • ◦Electrically controlled flaps just before the rear silencer minimize exhaust back-pressure and produce a BMW M sound, as well as giving precise feedback on engine load
  • ◦When closed, flow is forced into and laterally across the silencer; when open, flow is more directly through the narrow part of the silencer
  • ◦Different selectable drive modes feature different engine sound profiles
  • ◦Catalysts with metal substrate (less restrictive than ceramic)
  • ◦Exhaust always exits all four tail pipes
If it is controllable electronically, the sound could vary depends on what the flaps are doing. There is still much to find out.
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