kb 440 hyper pistons are lighter than factory cast or forged replacements.

I've beat the snot out of kb hypers without issue, but I follow the instructions to the letter.

anybody who has taken a serious look at the kb hyper vs the factory autothermic can see the hyper is much sturdier.

I use the 2618's in one care and kb hypers in the other without any problems with either. I think the big issues with hypers are idiots who won't follow the instructions and the same idiots who use a cast piston when a forged is the appropriate choice. some folks work at turning the purse into a sows ear.