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      11-05-2010, 04:40 PM   #11
reprod
Lieutenant Colonel
United_States
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Drives: '16 M3 ZCP
Join Date: Apr 2008
Location: Bay Area, CA

iTrader: (6)

My butterfly valve is always open at idle but then closes if I accelerate moderately to alleviate exhaust noise at the mid-level RPMs. If I accelerate quickly it stays open the full way. My exhaust note is quite noticeable at idle. I am still waiting to get performance exhaust on the next one.
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'11 Space Grey E92 335xi M-Sport (KWv1 Coils | Saddle Brown | Bamboo) (Returned)
'14 Mineral Grey F32 335i M-Sport (Dinan DHP | LED Lights | Coral Red | Hexagonal Aluminum) (Returned)
'16 Mineral Grey F80 M3 ZCP