I do the 620 pp supercar festival (most any track(I recommend Grand Valley or Indy)) with a fully de-tuned Chaparral 2J. I get 3.3 million every 10 min. and once the oil gets dirty then it gets better, I'm easily winning, even againt Speed 12's, Veyrons, and XJ220s. It is a win by the 4th lap on a bad race. The AI is like James May (Top Gear Fans), no speed or sense of direction (especially the Aston Martins. It's also great for XP, but thats not the problem. This race isn't timesome to grind either.