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      10-15-2019, 10:03 PM   #61
iamvanja
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Drives: 2015 640i GC white on red
Join Date: Dec 2018
Location: Phoenix, AZ

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Bigjule111 Spoke to the shop today about my install. The guy said he is pretty sure there will be some tubing for the M6 muffler install and is not 100% bolt on. Not sure if trying to upsell me or not, but got me thinking - if that is really the case, could droning be coming from that in your case?
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