If by cheating you mean track cutting, then I don't cheat.
If by cheating you mean me making 7 alternate accounts, transferring all my cars to them, and restarting my save game with 200 cars on a fresh save, then yes I have cheated, but i normally don't tune my cars anyway, so it's not like i would win many races anyway.
If by cheating you mean ramming other players because they're in front of me, then no i don't cheat. (I only ram people into submission when they push me out of my spot.)
If you want a good race, add me. My PSNs are on the left.