They will do it for 300$ a set. I was torn between making it 4.382 bore and getting new pistons vs doing this. Financially the difference will not be that big due to shipping both ways but I really want to see this coating in action. Heard only good stuff about it so far. I don't want to do the tops, but many people tell me to go for it... I'm worried about pontential problems when trying to clean coated piston tops.