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SPX QUANTUM SNOWMOBILE PISTON (SM-109730) SKI-DOO SUMMIT SP 154/165 850 ETEC New High-Tech CoolMax interior wicksSPX QUANTUM SNOWMOBILE PISTON SPX is proud to present the QUANTUM SERIES PISTON. The evolutionary piston is made from a space age aluminum alloy which maintains its high tensile strength up to 700F (300C). This is 50% higher than a conventional cast piston. This high resistance to temperatures significantly improves fatigue, strength and impact toughness. The aluminum alloy combined with the existing anodized crown, machine smoothed heads and MOS2