Thread: DIY: 335i Exhaust Sound Mod. Better, and even easier than golf tee mod.
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      05-01-2010, 10:34 AM   #333
Kolyan2k
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Drives: 2006 S2000
Join Date: Apr 2010
Location: Boston

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Spoke with BMW TECH. This valve is NOT to reduce noise, its there to heat up the cat.

Disconnecting electrical connection MIGHT void your emission warranty !
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