Removing weight from a flywheel makes a huge difference. Especially when coupled with other simple (and not so simple) mods. Removing two pounds from a 50 flywheel is difficult to fathom. The wall thickness on the face would be entirely too thin and would distort easily. I've seen it happen on XR70 & 100 flywheels that we've maxed out. We max out 50 flywheels as well, with no distortion. Two pounds? Really?