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      11-17-2012, 10:52 PM   #8
Eric335's Avatar
Drives: 2007 E92 SG 335i 6MT
Join Date: Apr 2011
Location: SW Florida

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2007 BMW 335i  [3.83]
Originally Posted by Lankster View Post
If he has OEM exhaust it wont drone like crazy... The flaps open once the cats are warm even when they are on and plugged in... If you wanna hear drone drive in a Muffler delete

Once up to temperature, they dont make a difference. It just stops the car from being so bassy/loud on cold starts.
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