MACHINED SMOOTH HEADS: A machined smooth piston crown should reflect combustion heat while reducing carbon buildup and protecting the top of the piston. Some tests have shown that a machined smooth head can increase HP and fuel economy by up to 6%.MOS2 (Teflon-Molybdenum coating): MOS2 is composed of sub-micron sized particles of solid lubricant and resin blends of solvents. The coating is rolled on, so it provides 10 times the bond strength of spray on coatings.HARD ANODIZED CROWNS: Pistons that are not anodized have a hardness of HRB 60, while pistons that are anodized have a hardness of HRB 105. This makes anodized pistons 75% stronger than non-anodized pistons.HYPEREUTECTIC CAST: Is a piston with increased silicon content. The end result is a piston that has an increased hardness, is more resistant to wear, and has an increased ability to withstand higher cylinder temperatures, pressure, and detonation.