This topic couple years old. Anyone care to update any improvements. I put a bike together back in 04-05 and was in the 5:90's with a 10m cheetah motor. Custom frame with a 225lbs rider. I'm currently building another and still researching motor options. Considering another 10m motor being I still have a set of trenched cases and an override trans. What new technology is out there and who's on top of their game with port work and aftermarket cylinders. I know they all claim to be the best but who can prove their work