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It's the alternator.
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2017 540i - MHD2+, VRSF DP, TU Pump
2015 X535i - CP Pistons, Manley Rods, Irox coated bearings, Cometic head gasket, Wagner head studs, M2 crankshaft, MILVs VRSF charge Pipe, Wagner FMIC PURE500 turbo, MHD2+ VRSF DP, B58 HPFP UR Front/Rear Sway Bars, Eibach springs, Bilstein B6
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