so uh... one thing, my amp finally showed up on the all system scan from protools, i changed the VIN to match the car, but found out something, factory coding it to the e90 chassis.. i lost ALL sound. now i checked what it was at for value prior and it was an E60 5 series, coded chassis back to E60, Boom sound came back. so with that said, if you replace it and the sound works, just change VIN on it, don't change chassis.
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