Unless you're totally in love with the OEM look of the Becker, why not just get a new head unit. They're cheap nowadays, integrate with the factory amp and have streaming audio capability. Not to mention the extremely better sound output...
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Present:
'08 e90 335i, '00 986 S
Past:
'99.5 B5 A4 1.8tqms, '02 e46 m3 convertible
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