I'm doing the Thunderhill event in Dec.. Did it last year too. Best automotive event available in the US I figure.
I would like to do it in a P-car in '09. A bit tough to get one going for $500 even with creative math. Using a Geo Metro with a motorcycle engine in it this year. 1400lbs 120 hp. it's pretty fast!
Here's a photo of this years car at our last test day. I'll keep you all in pix and stuff after the event.