I'm in the process of building up my D, it might be benson sleeved might not, havnt decided. But anyway, a huge concern of mine is longevity of my motor. One of the biggest concerns is piston:cylinder wall wear/egging/scratching. Which pistons expand slower/quicker. Or which piston is going to expand to the rate closest to which my cylinder walls will expand. Correct me if im wrong I believe its the silicone content. But the more silicone the weaker the piston. I was gonna get cp's, but i know they're very strong, so i'm worried they will expand too quickly and ruin my 1000 dollar sleeve job.