I know what im about to put on here will make some people mad but I raced about 6-7 years ago when I was 16-17 years old. It was not a sprint car but we used the same car on dirt we did on pavement. We were very competitve on pavement but we also had to change shocks tires and rear ends(because on dirt we were not allow a quick change and pavement we were). Simple fact is after about 3 pavement races is just made more sense to spend 3k or so for a pavement frame and but another motor than to run the same car and convert back and forth every nite. We raced at salem, and no the cost of our frame and motor was nothing like sprint cars but we wanted to compete not just be in the middle of the back either so therefore we had to change a lot of componets over to run asphalt and we had most of the parts to run the full pavement car so why not just buy one(only cost out pocket for it was frame and motor). I understand the combo, but it will not help in any way to bring pavement racing back because I dirt RR if you so desire can run many full nites of racing on and still be very competitive(i spoke to DC about this one nite at tss and he said hed run one 2-3-or 4 nites and if anyone was gonna burn one up it would be him). As for pavement 2-3-or 4 laps and you need a new tire. The combo car wont help a thing cause they'll all still be runnng dirt.