every sunday they dragrace by me in a circuit city parking lot. they hit like 0-80 in 3 seconds! there cool looking to . they try to save every ounce of wieght. they dont even have cooling heads just to save wieght! carbon fiber and titanium are a must on those things. they go through foam tires every race day.
They run with a cooling head, but a very small one. IT does save weight but the reason they run a smaller cooling head is for heat... that way it heats up much faster.