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BMW HI-FI amp connector harness for upgrading to aftermarket amplifier in Z application. Please note this amp connector harness will only work with OEM 42-pin Hi-Fi AMP connectorand will not work on vehicles equipped with Harmon Kardon (HK) sound system. It is designed for plug-n-play application without cutting or splicing factory wiring harness for installation of aftermarket amplifier(s). Please verify that the attached pin out diagram matches your vehicle. All wires are thin-walled automotive wire specification meeting orexceedingOEM wire size, 18 AWG for all signal and output wires and 12 AWG for subwoofer output wires. Signal wiresareequipped withhigh qualitygold plated metal male RCA connectors, notthecheap plastic one. All wires are crimped and soldered to ensure secure connection. All wires are labeled and come with connector pins assignment documentation. Power and ground connections are not included since most aftermarket amps require higher current beyond the amperage provided from the factory connector.