Quote Originally Posted by KeithGTP03 View Post
if all you're wanting to do is add an aux you can go this route....Amazon.com: GM12-AUXV2 PIE Adjustable Auxiliary Input For 2002-2005 GM / Chevrolet / Cadillac / GMC / Pontiac Class II Radios (GM12-AUXV2): Electronics
Errrr. I read the post wrong. If you just want an input to run an mp3 player or something, do what Keith said. If you want to be able to run outputs for say an amp, you can keep your stock head unit with a line converter.