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      08-30-2007, 11:04 AM   #45
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Drives: f30 328 xdrive, e90 335i gone
Join Date: Feb 2007
Location: Eastside

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Originally Posted by HyperM3 View Post
I agree to disagree with you and concur with Scott. Didnt notice enough to warrant doing it.

Secondly, and this could be pure coincidence, but 3 days after I unplugged mine in the trunk I had an o2 sensor go bad. When I took it to get replaced, my SA showed me the tech sheet where the solenoid sensor malfunction was recorded over 200 times. Then the tech said that the closing of the butterfly isnt necessarily for sound restrictions, but has to do with backpressure as well. This helps the cats warm up properly and get to operating temps. He said when this is disabled, you run the risk of damaging your emissions equipment.

Now I dont know if that was a load of bunk, but with the amount of issues Im having with this car, I dont need to give it anymore pushes in that direction.

Anyone elso can second Hyper's experience? I unplugged mine yesterday and first noticed no sound difference, but after a few highway miles I definitely think that the exhaust sounds deeper and lower (meaner). I also have a subjective feeling that the car is somewhat minimally quicker but it's probably in my head. who cares though? So if the unplugging causes no malfunctions I am inclined to leave it unplugged.