Manley 04+ Subaru WRX STi (EJ257) 75mm DE-STROKED 100mm +.5mm Bore 8.5:1 Dish Piston Set w/ Rings

If you're rebuilding the engine in your 2004-2012 Subaru Impreza WRX or STi with the EJ257 engine, this piston set from Manley Performance is a solid choice. These are forged pistons designed to handle more stress than stock cast pistons, making them ideal for performance builds or when you need to replace worn-out components. They feature a 100mm bore with a 0.5mm oversize, a de-stroked 75mm dimension, and a dish volume that results in an 8.5:1 compression ratio, which is a common target for boosted applications.

Manley uses their signature 2618 alloy forgings, which are known for being strong and reliable under demanding conditions. The pistons also come with tool steel wrist pins and a moly skirt coating, which helps reduce friction and wear on your cylinder walls. The ring lands and grooves are machined to strict tolerances for a better seal, and the skirt profiles are designed to be gentle on the cylinder walls while still generating power. Manley's unique manufacturing process ensures the ring grooves are perfectly square to the piston skirt, contributing to overall engine health and performance.

This set includes the pistons and rings, ready for installation. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.