Steve Hittle with Team Gorilla powered by Can Am. He's a factory sponsored racer.
2013 Maverick 1000. Silber Turbo, NX Kit, 32" Silverbacks, 3" Lift, etc. Roughly 18-1900 lbs race weight. If not more.
It broke the shaft on 12 lbs of boost and nitrous. Which was well in excess of 200 crank HP.
With that being said there were a few other variables that cause the shaft to break. That particular one had some issues with the taper on it. QSC did some upgrades to the clutch to enable the test of the comments to hold up.
With that being said. He snapped the shaft off at the crank. But never slipped a belt. There will be very few if any that make the power he was making at the time it let go.