Autocross around here is much less hard on clutches than any form of drag racing. We don't often have starts where a real drag race launch has a lot of value, and most everything is second gear. Relative to other regions, we also get a lot of runs... 5-7 per day is the norm, and we have a fairly active season with 17 points events, as well as a 2 day Divisional, and our new Solo 1/trials program...
http://www.RenoSCCA.com
The Audi club track events mostly run in the Winter & Spring, November through April, and are at many of the local Major tracks. PIR, Laguna Seca, Sears Point/Infineon, Thunderhill... Most allow other car brands, but getting your reg in early is a prerequisite, right Matt, and Scott?

They are a good deal, and quite well run IMHO.
I encourage you to do whatever you want, but 500HP out of a 2.5l engine is probably not going to end up being a great dialy driver, or road course car. In general, front mount =lag + bigger turbos = more lag == Drag car.
Probably one of the best prepared STIs we have/had is Jim Payne's with I beleive a full Vishnu stage 2? He will likley be out at the next Solo trials out at Lovelock next weekend if you want to check it out...
I'm sure you have read about boost creap issues, so be very careful as you start allowing the engine to breath better.
Definitely come on out to our next Stead Autocross, and at least go for a ride... We allow unlimited riding, even for competitors...
Look forward to meeting you when I get back...