I imagine you have a stock headunit? Do some research on Crutchfield.com for Universal add on Changers. They list 3 that are MP3 compatible - JVC CH-X1500RF, Kenwood KDC-CMP59FM, and Sony CDX-565MXRF. Check the features and see what you like, then check your local shops and ask opinions. Then shop around for your best price. As for RF modulation, I don't know as I have an aftermarket Changer and Head unit. Hope it helps.