I have a 2004 Chevy Cavalier LS Sport with the Factory RDS MP3 deck installed, No XM radio. I just bought a Zune and a FM Transmitter with it, and the FM Transmitter is total garbage and doesn't work. I'm looking at the cheapest option out there to make this happen. This is what I found on crutchfield:

GM12-AUXV2

Does anyone have this and does it work? All the reviews seem to be good and everyone seems to like it

My apologies, I realized this has already been posted, I just searched for the product name and it didn't come up.