Has anyone modified the xbox with a DC-DC 12 volt vehicle power supply? I want you use my xbox in my car without using a DC-AC power inverter. It seems like a lot of over head to convert from 12 volt DC to 110 volt AC just to have the internal power supply convert it back down to 12 volt DC. I've seen the DC-DC vehicle power supplies that are designed for the mini-atx. Any thoughts? I'd love to see a mod replacement for this.