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Attempt to record the noise with a video camera inside/outside the vehicle. I've had to use that trick before. It is very possible they are not able to reproduce it in the shop. But video proof should make them replace something.
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2020 X4M Comp. (currently stock) - Was 2015 335 MSport -MPPK -Borla ATAK -Dinan Sport+ - E.R. Charge pipe / 2013 X1 35i Sport - Dinan tune / 2009 X6 50i Dinan badged |