Thread: DIY: 335i Exhaust Sound Mod. Better, and even easier than golf tee mod.
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      07-29-2010, 06:29 AM   #348
B_2_B_P
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Quote:
Originally Posted by Kolyan2k View Post
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 !
What about an after market exhaust? My warranty is still good right?
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