I wonder if anyone knows how sturdy the Boxster's roll-bar really is -- if it perhaps will fold while rolling over at speed, i.e. making it a mouse-trap?
This was one of the safety concerns I had for my old roadster and its so-called style-bar, and hence got a race-approved roller instead:
http://ccrma.stanford.edu/~peer/roadster-rollbar.html
-- peer