It cannot be 21 degrees........That would be way too steep.
997 wheelbase is 92.5"
Porsche 997 - Wikipedia, the free encyclopedia
Heigth is 51.5" - Based on the lines I added, the clearance will be around 7.5"
You'll high center in the middle of the wheelbase, so 41.25 inches.
7.5"/41.25" = 16.2 % gradient. Even the 17% code would get you!
Yep, you'll high center with that bad boy. It might actually be worse, since I'm looking at the side. If anything hangs lower...
They might be able to make it steeper in the middle and more gradual at the ends...maybe...