Yeah it was getting around 8 hp with a pipe.

The ProSport has:
-heavy duty bearings throughout,
-a titanium central prop drive bolt.
-redesigned crankshaft
-heavy duty connecting rod
-redesigned cylinder porting for wider power range
-piston adapted to porting changes
-Added intake horn on carburetor

It swings a 26x10 6000+ rpm and a 24x10 7000+ rpm. But its a little more than a pound heavier.

That being said I think the 116 Xtreme is the same weight as the MVVS 58. Now THAT would be CRAZY in a 50 size bird! ;-)