I have the forged kit in my room. Con of the forged kit-have a coating on the thrust side that leaves a nice oily black residue in the cylinder when your checking your clearances. One more con of the hyper-kit, which is why I didn't get it, compression. 9.08:1 with a 58 cc chamber head. I'm running my stock heads with 61-62 cc chamber, I would be well into 8:1, lower than stock and not good for N/A power . Good for a blower, but you can't blow it with hyper's (not without sweating anyway). Anyway, nice kit, all new bearings, rings, all the gaskets, even comes with new valve seals, oil pump, injector o-ring seals, can't do it for cheaper. May want to consider balancing if you plan on excessive rpm's, the forged kit is kinda heavy. I asked my machinist and he said since I'm goin from a forged piston to another forged piston and I don't plan on 6000+ rpm I should be alright. Another Pro of hypereutectic kit-they don't swell as much from heat as a forged piston letting you run less piston to wall clearance, less likelyhood of piston slap after some miles (from what I've heard).