When I purhased an Apple iPod I was intent on hooking it up to my stock RF stereo. The only way to do it was to purchase an FM modulator. The downfall of the FM modulator is that it connects via your FM antenna lead thus it only provides FM radio quality, not cd quality.

I was very unhappy with the sound quality. This lead me to buy an aftermarket head unit that played mp3s via a cdr. I am much happier with the results.

My recommendation would be to buy an aftermarket head unit. You will be much happier.