Thread: Swapping out muffler 435i GC
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      10-27-2018, 07:16 PM   #6
BigJack75
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Quote:
Originally Posted by jh_f30 View Post
Also, since no one's mentioned it yet, that little black box with the wire attached is the exhaust flap module.
Thank you for bringing this up. What exactly does this do? Is this the golf tee mod?
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