I quit banging my head against the wall on this issue last summer and got a real nice, I-Pod friendly Alpine unit. I have found none of the transmitters are that good and none offer CD/Ipod quality sound. Save your money and get a new head unit. I think the Nav radio has some aux jacks but you still have to operate the I-Pod from the I-pod. Most of the new head units allow I-Pod control from the head unit. Trust me, its 200-300 bucks well spent. It can even be done cheaper than that, there was a unit that people were talking about that was selling on E-bay for around 150 bucks and it slides right in.