i just did this to my grand prix. I plugged it directly into the back of my factory CD player, popped in one of those tapes with the jack on the end of it, plugged my Ipod in and it works flawless. you still keep the controls on the steering wheel, the AM/FM button works, the CD button works and if you press it twice it triggers the tape player/IPOD. DO NOT HIT THE SEEK BUTTON WITH THE IPOD CONNECTED YOU WILL GET ERROR 10 AND THE TAPE WILL SPIT OUT. other than that it works great no loss in sound quality, im happy as a clam. tomorrow i will mount it properly

edit - I didnt even mofiy wires, i just simply plugged in, popped the tape in with the jack on the end and plugged in the ipod. it even shows on my HUD that a tape is playing. F'n GREAT!!!

WHOEVER THE GENIUS WAS THAT THOUGHT OF THIS DESERVES BROWNIE POINTS AND A CASE OF BEER!!