Mahle PowerPak 99.75mm Bore Piston and Ring Kit Subaru WRX / STI EJ25 2004-2021 vendor_Koyo Cooling Position: Intake/Exhaust Exhaust Duration: 270°

Position: Intake/Exhaust Exhaust Duration: 270° degrees Intake Duration: 274° degrees

KTA135 offers an adjustment range from 335mm to 435mm

The ARP 202-4207 Head Stud Kit delivers the strength and consistent clamping force needed to keep the cylinder head securely sealed under demanding conditions

2007-XK series

Seibon delivers exceptional craftsmanship

Mahle PowerPak 99.75mm Bore Piston and Ring Kit Subaru WRX / STI EJ25 2004-2021 vendor_Koyo Cooling Position: Intake/Exhaust Exhaust Duration: 270°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