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I got this same noise when I installed the M3 subframe bushings. It goes away once the diff warms up and/or once it gets warmer out. Some diff fluids are noisier than others too.
I'm going to order one of these as soon as my M-Factory diff comes in - can't wait!
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2011 135i DCT M/Sport Jet Black Cobb STG2+ | M3 Suspension Parts | ERW Charge pipe | VRSF 7 Intercooler | Cobb DP | MFactory LSD w/lockdown | KW V1 Coilovers | Apex ARC-8 | Dinan camber plates | BMS Intake | M3 Cluster & steering wheel | 1M Strut brace
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