Especially on the smaller tracks -- specifically those in the half-mile range, where running 42 cars means they're all bumper-to-bumper most of the time anyway -- speed ISN'T that important. They're lucky if they ever get the cars up to 90. That's exactly where they should run REAL cars. Make the necessary safety modifications, paint the cars up in normal NASCAR fashion and run straight pipes instead the the catalyctic converter/muffler exhaust system (for the noise factor) and let people see how the cars most of them buy -- 4-door V-6s -- actually perform against each other. It would be a lot more interesting than watching multimillion-dollar racing machines creeping around a little track.