I purchased my car from Rizza in Orland and they are fantastic to work with. I have been having warranty work done by Napleton Porsche of Westmont only because they are closer to where I live (they have been excellent to work with as well, but I think they may be a little on the expensive side for non-warranty work).
Yes, autocrossing is hard on your tires but it is a lot of fun! I have been running a few events lately and would be happy to give you information as to where I run or if you would care to join us for an event (I've been the only Boxster at the events I've attended). Drop me an email at
proth@tvmax.net if interested.