Mahle PowerPak 99.75mm Bore 79mm Stroke Piston and Ring Kit Subaru WRX / STI EJ25 2004-2021 Vehicle Model_Mazdaspeed3 ARP uses a premium grade

ARP uses a premium grade 8740 alloy that is rated far superior to "aircraft" quality

Part #: SCR4244-4

Part #: WCGLWRBC

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2004-2005 Subaru Impreza 2

Mahle PowerPak 99.75mm Bore 79mm Stroke Piston and Ring Kit Subaru WRX / STI EJ25 2004-2021 Vehicle Model_Mazdaspeed3 ARP uses a premium gradePart #: 930285027 Mahle's PowerPak piston assemblies include forged pistons, piston rings, pins, and wire locks all in one race proven package. The pistons are hand deburred and then coated with dry phosphate to protect against ring micro welding and pin galling during initial startup. For additional performance, Mahle added its proprietary Grafal anti friction coating to the piston skirts. Low drag rings, steel pins, and round wire locks complete the