Best thing to do is see whats being raced local to you, or you will be stuck with something useless. Go to a few races and see what's used and who builds the front runners. I started out in Karts dirt and asphalt, then moved into 360ci Sprint Cars. Got hurt pretty bad in Karts, so I bought the Sprint car because of a cage and 5pt harness. Raced Sprints for years then got into another bad one at about 120mph, and caught fire.. So I turned my tow rig into a race car lol.