Mahle PowerPak 99.75mm Bore 79mm Stroke Piston and Ring Kit Subaru WRX / STI EJ25 2004-2021 vendor_Walbro Tubing Kit

Tubing Kit

150% increase in torque capacity

This dual zone approach results in a flatter flow curve

The DB Series allows accurate monitoring of air/fuel ratios to ensure optimal engine performance

NOTE: Each size is available in custom cut lengths up to 300 ft

Mahle PowerPak 99.75mm Bore 79mm Stroke Piston and Ring Kit Subaru WRX / STI EJ25 2004-2021 vendor_Walbro Tubing KitPart #: 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