http://www.mp3-box.org/mp3-fm-transmitters/
Repurpose Computer Speakers for Your Car for Better, Cheaper Audio on the Road [DIY]
# diy The speakers that come with your car are generally pretty awful unless you shell out some cash for a better set. Additionally, not all cars come with an auxiliary input for plugging in your smartphone or MP3 player. If upgrading is not an option, or you just don’t want to spend the money, here’s a fairly simple DIY project that can bring better audio to your car. More »
MP3 FM Transmitter SD MMC USB AUX