CP Piston & Ring Set for Subaru EJ25 WRX STi - Bore (99.5mm) - Size (STD) - CR (10) - Single Piston

Forged from 2618 aluminum, this single piston and ring set from CP Pistons is built for the demands of Subaru EJ25 engines found in WRX STi models. The 99.5mm bore and standard sizing ensure a precise fit for rebuilding or upgrading your engine's top end. With a 10:1 compression ratio, this piston is designed to work well with naturally aspirated or lightly modified setups, offering a solid balance between power and drivability.

CP Pistons uses a 2618 aluminum alloy, known for its strength and ability to withstand high temperatures and pressures common in performance engines. This material choice means the piston can handle the stresses of increased combustion events without deforming. The set includes the piston and rings, ready for installation by a qualified mechanic. It's important to note that this part is not CARB approved and cannot be shipped to California.