World's Fastest R/C Car, anyone?

[Maxzillian]

Honestly, the car shouldn't need a ton of power. The way you can get around that is by making a car with great aerodynamics and very little rolling resistance. So basically a car with narrow sedan tires or even foamies and a body that is as low as possible. However, if you do want to go ahead with the twin engine idea, I'd have to agree on using a 1/8 scale buggy. They have plenty of room for such a setup and I've seen it done several times before (the most memorable being Greg Vogal's Nitro USA-1 with twin engines and the ability to hit 67 mph).