Don't know if this has been posted yet but the M performance exhaust sounds amazing!!
Quote:
Yesterday I filmed this magnificient BMW M4 Safety Car during a DTM presentation in Cologne. The loud sound absolutely surprised me when it first revved (As you can see by the shaking video at that point  )
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Admin note: The MotoGP Safety Car also runs the M Performance Exhaust, but catless (
source), so this DTM Safety Car may possibly also be catless.