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      09-28-2009, 10:49 PM   #140
supraking
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Drives: 128i Coupe 6MT
Join Date: Apr 2009
Location: Montreal

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2009 128i Coupe  [0.00]
Quote:
Originally Posted by GtiGyver View Post
This is correct, in fact, above the amp in the left side of the trunk you can find the solenoid that the ECU uses to control the exhaust valve position. If you disconnect the solenoid as I did the valve stays open, no zip ties, no golf tee and no CEL.

The valve is in no way related to performance, it is only there for sound. Also, the reason why the engine is louder after a cold start is obviously in part due to the valve being open, but most importantly due to the engine using massive valve overlap to warm up the first bank of catalytic converters.
Could you take a pic to show us what to disconnect? Not about to go tear out the wire for my brake lights haha...
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