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      11-05-2010, 03:40 PM   #11
reprod
Major
United_States
14
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Drives: 435i (M-Sport)
Join Date: Apr 2008
Location: New York, NY

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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'08 Sparkling Graph. E92 335xi (ZSP w/ 18s | Saddle Br. | Grey Poplar) (Returned)
'11 Space Grey E92 335xi M-Sport (KWv1 Coils | Saddle Brown | Bamboo) (Returned)
'14 Mineral Grey F32 335i M-Sport (DHP | LED Lights | Coral Red | Hexagonal Aluminum)