Engineered, forged, and machined in the USA from 2618 aluminum for improved tensile strengthArmorGlide? Skirt Coating: seizure resistant, friction reduction, and quieter operationFully machined crown featuresPrecision ring grooves, anti-detonation groove, and additional ring seal improving featuresForced pin oilingDesigned and built to withstand heavy to severe duty performance applications. Professional Series forged racing pistons from Wiseco are no-expense-spared pistons designed for the serious racers and builders. Packed full of custom-level performance and durability features and provided with premium rings, Professional Series pistons are designed and built for use in heavy to severe duty race builds. Remove your limits with Wiseco?s Professional Series.. Wiseco Mitsubishi 4G93 Piston Set, 82.00 mm Bore, 30.25 mm Compression Height, 0.748 in. Pin Diameter, Sport Compact, Set of 4.. Wiseco 97-02 Mitsubishi Lancer 4G93/4G94 1.8L 82.0mm Bore .040 Size -2.5cc FT 1.190CH 8.9 Piston Kit. Piston Set, Mitsubishi, 4G93, 82.00 mm Bore, Sport Compact, Set of 4. Mitsubishi 4G94, 82mm Bore. Mitsubishi 4G93 1.8L. Engine Piston Set. Piston Set

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