this was only necesarry for CAN clear to work properly... but you don't HAVE to do it..
Car sounds better with the flapper disconected anyways... i unplugged it at the dealership the day i took delivery, never plugged it back in. The don't even notice(or care), when the car goes in for service, not even when it was stock.
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2007 328i Crimson Red *SOLD*
2010 335i MSport AW E92
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