To use the adapter plug that hooks up to an Audi Alpine... a) There's gotta be a mode button on the radio face ( hard coded Gamma only ) b) the harness needs to be there ( late '92 A100 & newer ) Up till '96 model year the Audi CD player was only intended as a port installation. Your best bet might be CD player with an RF adapter from a monetary point of view. Vince Lyons