You are correct, the styrene and lexan bodied cars don't race together because of the weight issue. I think most of the styrene models are being used in drag racing. But there are a lot of oval or tri-oval tracks around the country that run a form of NASCAR vintage style "hard body"(as we call them)classes on a heavy brass Parma FCR chassis. Lots of bashes and crashes and bumpers flying fun. My fav bodies are the '68-69 Torino, '55 Chevy, and '49 Merc.