JE's patented Perfect Skirt coating makes piston slap, false knock, and cold-start wear a thing of the past.
For the first time ever, 2618-alloy pistons can be installed with piston-to-wall clearances near that of an OEM piston

Ultra Series pistons combine JE's premium features and brand new, cutting-edge technology in a standard piston kit! This includes aligned grain flow technology, a proprietary JE technology that aligns grain flow in critical areas of the piston to improve strength, and many other high-end features.

JE's revolutionary Perfect Skirt coating is one of many technologically advanced aspects of the Ultra Series. It protects the piston skirts, reduces friction, while eliminating cold start piston slap and false hits on computer controlled engines.

All Ultra series pistons will come standard with ceramic crown coating to help repel combustion heat for longer life and better exhaust evacuation characteristics.

Thicker, high-quality piston pins are another strength-enhancing feature of the Ultra Series line. Combined with unique grain flow forging technology, the Ultra Series is ready for tremendous power.