991 3.4 faster than a 981S or 981S Coupe. Sometimes
The 991 has an advantage here due to it's added traction. When the road/track is narrow and very twisty the 981 chassis has an advantage because it's slightly nimbler and better balanced. Both great but different.....
"A mile of highway will take you one mile. A mile of runway will take you anywhere."
More fun, though with a drop top drive along some back roads, like this UCR fun run. Taking it easy on the shifts and revs with CURVEN8R 2 just being 3 days old and 400 miles on the odometer.