HKS PISTON KIT FA20 2.1L LOW COMP

The HKS Low Compression Stroker Replacement Pistons are engineered for the Subaru BRZ, Scion FR-S, and Toyota 86 equipped with the 2.1L FA20 stroker upgrade. These forged pistons are designed as a direct replacement for the pistons included in HKS 21004-AT003 and 21004-AT004 stroker kits. They feature specially forged raw materials for durability under high stress, a recessed design for high-lift HKS camshafts, and an optimized compression ratio for flexible tuning and high boost. The 3D-designed piston crown is tailored for the stock direct injection system, and a molybdenum coating on the skirts reduces friction. These pistons maintain the factory 86mm bore, simplifying installation by eliminating the need for boring, honing, or sleeves.