I bought a pretty basic Alpine head unit yesterday (CDE 9874) because I just got an iphone and the aftermarket sony I have now doesn't have an aux input or anywhere else to hook up the ipod. Can anyone point me in the direction of a website that explains how to install an aftermarket head unit when you already have an aftermarket in there now? I'm assuming I can just use the same wiring harness, etc that i have in there but really I have no idea. I didn't want to shell out $50+ for installation if it was a pretty simple job. any help?