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      01-07-2012, 09:02 AM   #18
tp550i
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Drives: 2011 550i Sport
Join Date: Jul 2011
Location: Tampa, Florida

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Quote:
Originally Posted by 5fix View Post
How is the sound with two outlets open all the time on each side? I am concerned about drone with after-market exhaust, but would like a litttle more engine note, like on my e60 550i.
I was surprised to note very little difference. At idle and low rpm its slightly louder - but no where near what I expected having both sides open all the time. At cruise, there is no droning. Left me wondering why they installed vacuum flaps to begin with.
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F10 550i Space Gray | Dinan Stage 5 | Eisenmann Race | ACS springs | 20" Ferric Grey 312 - Michelin PSS
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