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Saw you posted in the main forum the harness didn't fix your issues. Are you sure there's nothing wrong with the amp? Known issue (especially with tinting) water can get into the amp location in the boot and fry it.
Not sure if you can, but have you tried unplugging the amp to see if the "sound" issues still occur?
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2020 MY21 BMW M2 Competition 6MT | Black Sapphire
OLD 2010 BMW 135i M Sport 6MT | Le Mans Blue
2016 BMW F15 X5 30D | Sapphire Black | Black Leather |