As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its range of Ultra Series pistons - The Strongest Pistons in Powersports. The Ultra Series combines all their premium features and a revolutionary new forging technology into an off-the-shelf piston kit. This includes an Aligned Grain Flow Forging, a proprietary JE technology that aligns forging grain flow in critical areas to improve strength.. "Perfect Skirt" Coating - This patented skirt coating reduces friction and provides a tighter clearance that eliminates cold-start slap and false knock on computer-controlled engines.. Thermal Barrier Crown Coating - This ceramic-based coating reflects heat into the combustion chamber, therefore reducing piston crown temperatures and improving exhaust gas scavenging. Every feature on Ultra Series Pistons are optimized to perform flawlessly in high horsepower racing engines. This includes lateral gas ports, thicker ring lands, and dual pin oiling. Aligned Grain Flow Forging - These optimized 2618 alloy forgings offer added strength over traditional 2618 forgings.. Includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings. JE Pistons JE ULTRA SERIES-11-14 Polaris RZR XP 900 Piston Kit. 9310 Alloy Wrist Pins: These high strength, premium thick wall. Engineered, forged and machined 100 percent in the USA

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