Pistons

It’s been a little while but the KBs have a higher compression height and they are lighter iirc. So similar cost but more return on investment at least in my opinion.
The ring gap recommendation on KBs is because of the alloy they use which I’m pretty sure is different from Speed Pro. All hypereutectic pistons are light, strong, and thermally stable, but they are like tool steel: brittle. Plus in KBs case they seem to tend to hold the heat in the crown and top ring. So you have to account for that heat in the top ring gap, or the ring ends can butt and the ring warps in the groove and snaps the edge off. It’s not detonation. It’s heat. Detonation if its bad enough to cause catastrophic failure looks very different and the piston basically shatters.