Rumble City is a game of hot rod combat. It is free to print, copy, distribute etc. Send me an email at gadjogadjo(at)hotmail(dot)com if you wish to comment privately, or if you want me to post a picture of your car, or art, or your rules adjusment, or scenario, or play report, or whatever really.
Or, just comment on the posts.
And yes, it's very similar to other car combat games, but it is also quite simple, free, and fun. You can play at whatever scale you like. Or almost no scale.