Not sure why they mis-identify the driver... it's not Roman Caresani, but Pascal Pandelaar driving the Duel '65 911. There are several YouTube vids of him in this car, as well as the original version of this tape. FIA requires 5" wheels in that class, and anyone who's raced a SWB 911 on skinny tires knows that drifting corners is the fast way around.
That pass on the Jag always gets me. There's also a view from the wall of his set up into Eau Rouge that's impressive.