DIY: Speaker and Subwoofer upgrade. Harman Kardon based System - Page 3 - BMW M3 and BMW M4 Forum
Retrofitted heated seats to my 330ci recently, using the official BMW harness. : r/e46
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DIY: Speaker and Subwoofer upgrade. Harman Kardon based System - BMW M3 and BMW M4 Forum
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DIY: Speaker and Subwoofer upgrade. Harman Kardon based System - BMW M3 and BMW M4 Forum
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