When you say 'car' do you mean carpet or pavement type cars, or are you being generic and in that case you could mean buggies as well ? Aside from whatever opinions you get in here, another great place to find out what's the weapons of choice is your local track. Go there, see what everyone's running. Talk to the racers, ask them questions. If you are sincere about wanting to know, they will talk your ear off. Good luck.