Mahle PowerPak 99.75mm Bore Piston and Ring Kit Subaru WRX / STI EJ25 2004-2021

Product Description

Part #: 930285127

Mahle's PowerPak piston assemblies for the Subaru WRX and STI includes 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 Mahle PowerPak package.

Specs:

Bore (in):3.917 in.

Bore (mm):99.750mm

Piston Style:Dish, with four valve reliefs

Piston Material:Forged aluminum

Compression Distance (in):1.209 in.

Piston Head Volume (cc):+22.00cc

Wrist Pin Style:Press-fit or floating

Pin Diameter (in):0.906 in.

Gapless:No

File Fit:No

Top Ring Thickness:1.2mm

Top Ring Material:Steel

Top Ring Facing Material:Gas nitrided

Second Ring Thickness:1.5mm

Second Ring Material:Iron

Second Ring Facing Material:Cast iron

Oil Ring Thickness:2.8mm

Oil Ring Material:Stainless steel

Oil Ring Tension:Standard