How may of you have wanted to swap out your Mach 460 head unit for an aftermarket unit that plays MP3's. Well, in the past you would have had to basically rewire the car an use aftermarket amps for your speakers. I just ordered an Alpine CDA-9853 from Crutchfield and they offer a new harness that allows you to use all your factory amps/speakers without rewiring the car. They have a new RCA adapter that plugs into the factory amps. I will let ya'll know how the install and sound quality is once I put it in. Finally, a reasonable alternative to the non MP3 playing Mach 460.