Ben,
I was talking to Van Steinberg about ITR, He told me that when he was preping the cars for his exceutive race series a few years ago the Boxter was so fast that they had to put intake restrictors on it to slow it down enough that the other cars could keep up. I think it's the way to go.

If anyone is interrested in spending lots of money to end up at the back of the pack, I will sell you my Contour SVT with 150,000 miles cheap. Great street car though. It will never be as fast as my ITS car, let alone the ITR cars.