Common sense is unfortunately no longer common in this century. Quite hard to come by, in all truth. Since you have no real clue about his mods, run him for fun. No $$. The only time you run for $$ is when you know you will take his cash. There's no point in losing what you can't afford. Go beat up on a fancy body-kitted Honda civic si for some practice and move up the ladder to integras. And never race without knowing the other guy's mods. Trust the smurf, I speak from experience.