Hey T2F!
There is another Thunderhill event in July! Hope to see you there! I went to the last one and it was great! Though I didn't have my Boxster there we did have my Bro's SVT Focus and my Bosses GT3. Not a ton of cars at the Unlimited laps events. So that means lots of track time!
http://www.unlimitedlaps.com/eventdetails/20060707.html