Hello,

I see there is an O.S. 15CV-X, and a O.S. 15CV-X Hyper, and O.S. 15CV Hyper

What the heck does Hyper do to the engine? They seem to be more expensive, but the stats on all 3 are the same! I picked up 4 cheap piston/sleeve's that will fit all 3 engines, and im trying to get the best bang for the buck.

Please help!!! Thanks!