[thstone]

IMHO, a well-maintained Boxster is a very good track day car in terms of both performance and reliability. And since you've run AX on a consistent basis the majority of weak spots would have already raised their head.

The big difference between AX and a continuous lapping event will be higher speeds and longer duration so tires, brakes, and fluids become more important.

The only thing that I will add is to be sure to take care of yourself in terms of rest the night before and proper hydration and food through the day. You'll find that maintaining 100% focus through four or five 20-30 mins sessions to be both mentally and physically exhausting. Hydrate early and often along with eating foods that "agree" with your personal metabolism.

Let us know how it goes and post up some pic's and/or video after the event!