You guys should look into 'Canned Heat" from tyco. They're a bit bigger, probably about...eh... 5" long, 2" wide... but they're really fun. Bigger, slower, easier to control, and more realistic looking. I modded mine. Lowered it abit and teflon lubed everything so it was faster than a friends. hehehe.

- Ca$h

PS: Mine's an audi TT