i have a kenwood dnx7120, navigation, bluetooth, blah blah.... anyway went to local aftermarket shop and i pick up a y adpater, and i have the stock radio installed in the trunk, the radio is in a small wood box that i put together and it is attached to the roof of the trunk ( behind the stabilizer bar ) it sends all the wires u need for just the radio in the trunk and leaves the rest up for the head unit and everything works like the stock radio was still there oh and i have the 04 compg