Robert, i'm probably going to get blasted for this post, but i don't care. Most of the engine builders on this site are just trying to sell their product and that's O'k, but they don't always offer the best advise. First of all you can't run a piston with over a 150 shot of nitrous, when the ring land is between .150 and .187 down from the piston top, coated or not coated, and a lot of the pistons have the top ring land raised for gas and a quick seal. It's the same with a blower motor which i run sometimes. The heat is extreme on nitrous and a blower moter. I personally like the Probe pistons because the top ring land is down .437, and good for nitrous or blower, you also can't run a 1/8" top ring, due to distorsion, and they have to be steel, due to the heat involved with nitrous.
I've built a couple nitrous motors in the last couple yrs and i used Probe pistons due to the lower ring land and they are both surviers with 250 shots.
I personally don't like nitrous, but i'm in LOVE with blown alcohol motors, and they are close too the same.
JMO
Zip.