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Just too many variables for anyone to know. Boxster rollovers are extremely rare but they do happen. I know of one at Laguna Seca race track. The driver is very tall- (6'5"ish) and did have the BK extension. He walked away without serious injury.

I also have the rollbar extension along with a lowered seat in my 98. I have been in multiple rollovers before and don't really look forward to it in any car. If I was going over in the Boxster I would grab the bottom of the steering wheel and duck down to avoid a direct hit to my head. Supporting the weight of the car with my neck might not work out all that well.