Took out both head unit and cd player, looks like someone had an aftermarket deck in there atone time. There was a harness that you could plug the BMW stereo plug into and it goes to a single DIN stereo plug. The red and a Yellow wire are still spliced in somewhere, but harness is not being used. Also spliced into this aftermarket harness is what looks to be an iPod interface box. Should I just remove all of this?