Hyperyucky is still cast. The metallurgical properties of the forging process allows for more "time" before a failure occurs. The casting is more brittle and subject to failure whereas a forging will go "plastic" for a given time before failure with the right(or wrong) situation. If one is a tuning genius and/or has unlimited access to a wideband setup, cast pistons will be fine under most conditions. For the rest of us, forgings buy more time while we figure out the tune and fuel flow dynamics.

By george I think you've got it, kojoe.