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Wierd noises after installing my downpipe
I bought a aftermarket downpipe on eBay cause the vrsf took too long to ship after 3 months I got a refund ridiculous. I noticed recently that after aggressively drive my 440i coupe (b58 motor) on sport plus it has this weird thumping/ dragging sound underneath and since winter hit it just got worse anyone have a idea or dealt with this issue before?
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