FWIW I've done 4 PCA HPDE's now and am leaving for my 5th tomorrow. I am 6'3" on my best days and have the BK rollbar extension. I doubt I have an inch of clearance with my helmet on, but I do have clearance between the top of my helmet and the underside of my top. I have never seen anyone perform a broomstick test on any Boxster at any HPDE or any pre HPDE tech inspection. I've seen one guy in the instructor group who is at least as tall as me with a 986 Boxster S with a hardtop and he doesn't have any BK extension. Some tracks have rules stating the BK rollbar extension is required for a 986 though.
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