I also have been looking into ways to play mp3's without changing the head unit. I found a simple device at Walmart. It's called a VR3 mp3 fm modulator.It sells for about $30.00. What's unique about this product is that it has a usb port that accepts memory sticks. I downloaded songs onto the memory stick plug it into the lighter socket; adjust the radio to 88.1 and I can play the downloaded music through the car speakers. It also has a plug on the side to add a portable mp3 player which I aslo tried. If you load good quality music onto the memory stick it sounds pretty good. I do not get any intereference; but you guys in the city might. It has six fm stations to choose from. Hey, for 30 bucks it's worth a try; and you can always return it to Walmart.