2-to-4 channel adapter for standard / radio only wiring premium wiring NOTE: you will need to

NOTE: you will need to remove your OEM trunk amplifier

This is the OEM mounting hardware needed for the factory Blaupunkt QuadroBoost trunk amplifer

PLEASE NOTE:  About every other tape deck needs repair or replacement

If your late 89-93 car came with the 4 channel radio version of BMW Sound System

and we've got you covered

2-to-4 channel adapter for standard / radio only wiring premium wiring NOTE: you will need toExactly equivalent to BMW part number 65 12 1 379 329. Plugs into fader connector of a 2 channel standard radio only audio system. With this adapter you can run an OEM 4 channel radio like the CM5908 or KE83 ZBM without a trunk amplifier in a car with 2 channel radio only wiring. Also compatible with Amp+ if your car has 2 channel standard radio only wiring.