Anyone have a review on them? I know some German performance cars and z06 corvettes use this technology, its lightweight and undercut for flow, and helps dissipates heat. and being lighter helps when revving very high. if I am not mistaken ITR valves are similar. but am not sure. anyway does anyone have an experience with these valves?

 

me personally, i think the stems are skinny enough, and making them hollow just adds to stress that can lead to catastrophic failure. but thats my thought.