Mahle PowerPak 99.5mm Bore Piston and Ring Kit Subaru WRX / STI EJ25 2004-2021 discontinued-no-inventory The pressurized carbon fiber gas

The pressurized carbon fiber gas canister ensures smooth hood opening and closing without having to use too much force on your end

8L motor and to sound great doing so

2-bolt design

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

(includes mounting hardware

Mahle PowerPak 99.5mm Bore Piston and Ring Kit Subaru WRX / STI EJ25 2004-2021 discontinued-no-inventory The pressurized carbon fiber gasPart #: 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