This Instructable is to walk you through the steps of making your Xbox360 capable of being used in a car without an inverter. It involves only a few parts and the ability to solder. Obviously a Xbox360 would be helpful along with solder, wire, and soldering iron or gun. I had a Roadmaster VRFM8BLN Mp3/WMA Fm transmitter w/usb lying around and wasn't using it.Roadmaster
I decided to put it to good use and allow it to power my Xbox360. This is how I did it.
Disclaimer: I am not responsible for the death of your Xbox360 or your automobile if this project goes a rye. There is slim chance that anything could happen but be careful and when it doubt use a ohmmeter to ensure the correct volts and amps. GOOD LUCK!