Hey guys I'm looking into racing lightning sprints but I'm a heavier guy. (5'7" 260) Just wondering what size seat can fit in these chassis and have you guys seen many big guys running them?

You probably want to stay away from older narrow body cars. Not much room for a guy your size after the chain tunnel takes up 3 inches. Hench, Hyper and Foz chassis would be best. If you know your seat size, call any of those companies for advice. I'm sure they can tell you if it will fit.