Rear-engine, 2WD, (rear WD) 911 GT3.... mostly uphill (except for a very short bit about 1/3 of the way up) Pike's Peak run... Nearly all of the "drifting" you observed was on the dirt (now bein' a sowthurn boy, yew gotsta know good dirt-track counter-steerin' when ya see it!). He was really fighting the steering-wheel sometimes... BTW, that Porsche will do 65+MPH in 2nd gear, just so's you know.
I had a guy I used to work with who decided to "retire" early (@ ~45) because he had the money he wanted for retirement, house paid for, and royalties coming in from some inventions. He also had hit the "wall street lottery" with some pre-IPO stock he'd taken for some work he'd done on the side... Anyway... He went out and plopped the cash down for a 911 "stock" racer (street legal, but stripped down for weight with light-weight replacement racing parts and some engine tweaks - idunno, but it was still in the "stock" class). For awhile, to get used to it, he'd go around the clover-leaf at Rte2 & I-495 (for those who know the area in Massachusetts); He never got out of 2nd gear and only dropped below 60MPH when there was another car coming! He got pretty good too. Took courses, learned counter-steering, drifting, and sliding the rear out for a 90 or 180 turn. He wanted to do the Peak run. He waited until he bought a second Porsche before tweaking the first one more. He did the Peak run, the Silver State challenge, and lots of weekends at the Pocono road course. Then he met the right woman, got married and became a "Daddy" (a few times!) and... started driving like my grandma... I tried to get him to "permanently lend" me the racer to no avail. He takes it out for "Sunday" drives on rare occasions, but no more racing.

such a pity...