This is what my wife and myself use at Thunder Valley:
http://www.summitracing.com/parts/gf...rgbk/overview/
You will also need a fire jacket since you will be running an aftermarket power adder:
http://www.summitracing.com/parts/gf...rgbk/overview/
Cheap insurance for me, not because of my car but you never know what the idiot beside you will do.