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9 312 592 Amplifier 2009-2016 BMW 535i 535 550i 550 Cummins This is a good ecmStock # 4G119 This is a good amplifier computer for a 2009 2016 BMW 535i 550i. The part # is 9 312 592. It comes with a 90 day warranty. Make sure your part number matches before ordering. Computer may need to be reprogrammed to your vehicle. Used parts may have minor dings and scratches.