Manley Size STD Stroke 79mm Bore (99.50mm Grade A) SINGLE Piston w/ Rings WRX STI EJ257 2004-2021 Wheel Offset_40mm The new Basic kit utilizes

The new Basic kit utilizes the adjustable gear lever from the 4002 kit

elevated boost levels

The DS2500s have 35% less compressibility than competitive products

The HKS SSQV4 is designed as a 100% venting blow off valve

allowing you to dial in your desired front stiffness

Manley Size STD Stroke 79mm Bore (99.50mm Grade A) SINGLE Piston w/ Rings WRX STI EJ257 2004-2021 Wheel Offset_40mm The new Basic kit utilizesPart #: 612000CA 1 Manley Subaru pistons are made from high strength 2618 material and manufactured to provide DROP IN installation and correspond to the OEM Grade Range A or B bore sizes. To order these pistons simply select the appropriate mix of grade range pistons for the engine block's requirements. The proper clearance is designed into each grade range. These pistons come standard with Premium Chrome Moly 0. 180" wall pins suitable for moderate