Mahle PowerPak 99.5mm Bore Piston and Ring Kit Subaru WRX / STI EJ25 2004-2021 discontinued-no-inventory Part #: PBF913

Part #: PBF913

yet flows enough for larger pumps like the Aeromotive A1000

Their silicone couplers are made from fiber reinforced 3-ply silicone tube

2-bolt design

Part #: SK-300BC-2-W

Mahle PowerPak 99.5mm Bore Piston and Ring Kit Subaru WRX / STI EJ25 2004-2021 discontinued-no-inventory Part #: PBF913Part #: 930285117 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