IDK if u guys are aware of this game. Its called "generally", but its basic a RallyCross game.
I think its my all time favorite (racing genre). Its so simple yet so fun. You can create tracks, cars, sound, change rules, AI levels, points system. its all pretty simple. And it has less than 2mb haha. Heres the official website:
http://gene-rally.com/download/

And here >> http://forum.generally-racers.com/ you can find some GREAT QUALITY tracks and cars that fans upload. Theres lots of WRC content too. (stages, cars etc).

hope u all enjoy