Porsche Boxster OE Wiring Harnesses & Stereo Adapters Universal Wiring Harness with Aftermarket Stereo Plugs by Metra®. This harness plugs into the back of aftermarket stereos to permit you to integrate it into your vehicle. Just splice the wires to your vehicle harness. Mates directly with the stereos Permits integration with car harness porsche « Wire Wiring Harness PORSCHE Fiber Optic Radio Wire Harness & Retention of Steering Controls MOST-2. Stereo Replacement Interface with built in Steering Wheel Controls Lets you keep steering wheel controls when swapping in an aftermarket car radio Selectable switch for Pioneer, Alpine, Clarion, JVC, Kenwood and Sony. Retains steering wheel controls.