great post, thanks for sharing. love these real world comparisons, and glad to hear that you took a GTR "scalp"

having said that, i do believe (as you mentioned) that a stock turbo would be in trouble.

no offense and i don't mean to doubt your story, but just curious as to the skill level of the GTR driver? we all know that on a track, driver counts at least as much as the equipment, so could it be that you're a much better pilot than the GTR owner/driver?

if you were running in the same group, that suggests grouping in terms of TIME right? but not necessarily experience?

finally, also interesting to note that his performance seemed to drop off... wonder how much of this has to do with you getting faster vs his car beginning to feel the strain of many hard laps (stamina being a strength of Porsches we all recognize).