I was looking for a solution to play my favorite MP3's in my roadster without replacing my factory radio or doing a ton of wireing. Well I found a very cool solution and it works perfect! I went to Radio Shack and I bought a 12 volt cigarette lighter FM-MP3 player that you connect to your home computer via your USB jack and then upload your favorite MP3's to the FM player with the supplied USB cord. Once uploaded you tune your Crossfire's radio to your desired unused FM station and it will broadcast via FM signal to your radio no wireing needed. It holds 2GB of music and works excellent using the factory radio. Now my car retains its "factory" radio with MP3 capability's.