Quote:
Originally Posted by Ickdeep
I first installed my M5 mufflers with the vales closed but it was just too quiet. I then opened up my vales its so worth it. Yes, it is about noise control. Closed was just not loud enough of a change. There is no negative effects for mufflers or valves.
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Is this only the rear mufflers, or full M5 exhaust system?
Thanks