You could do that, or for the same price get a dual core 1.6ghz atom, with a DC-DC smart psu, and bluetooth built in. But if you really need the power, that would work. Just make sure to get yourself a decent inverter so it can survive engine cranking as most sub-$400 ones can't.
"stop with the REINSTALLS, what do you think we got some lame-o installer!!!" - mitchjs
RevFE My Shop
What does the mp3car starter kit include? I looked for a dual core 1.6 atom but I couldn't find any on newegg. I also thought i would need the power for the dvd, video, navi, and everything else to work properly.