Looks like you guys have a 24hr every year?
Price for early registration is about USD6,400, and the winning team can walk away with a profit as the winner's prize us USD10,000.
I spoke to Juha Roiha (karts in the Philippines) about it. He's done it a few times and looking to do the the event in February 2008 as well.
Anyone here done the event? Anyone doing the one in just a few weeks?
Information on the race events at http://www.thailand24h.com.

