Manley Performance Forged Piston FA20F 86mm STD 10:1 Dish Single Subaru WRX 2015-2021 | 632700CA-1

Overview

The Manley Performance 632700CA-1 is a precision-forged dish piston engineered specifically for the 2015+ Subaru WRX FA20F turbocharged engine. Designed for enthusiasts and builders who demand OEM-plus reliability with performance-grade strength, this single piston (Grade A) delivers a factory 86mm standard bore fitment at a 10:1 compression ratio — ideal for boosted street builds and light track applications. Whether you're refreshing a worn engine or building a reliable high-output FA20F, this is the best forged replacement piston for 2015+ Subaru WRX builds.

Key Features & Benefits

• Precision Forged Construction — Forged aluminum alloy provides superior strength-to-weight ratio over cast pistons, withstanding the elevated cylinder pressures of a turbocharged FA20F platform.
• 86mm Standard (STD) Bore — Grade A — Drop-in fitment for factory-spec bores that are within tolerance; no overbore or custom machining required for a standard rebuild.
• 10:1 Compression Ratio Dish Design — Optimized dish profile lowers effective compression ratio to complement forced induction tuning strategies, supporting higher boost levels safely.
• FA20F Direct Application — Engineered to the exact specifications of Subaru's FA20F direct/port injection turbocharged engine, ensuring correct pin diameter, ring grooves, and skirt geometry.
• Single Piston Sold Separately — Purchase only what you need; perfect for replacing a single damaged piston without committing to a full set.
• Manley Performance Engineering — Backed by decades of motorsport and OEM-replacement piston manufacturing expertise, trusted by professional engine builders worldwide.
• Optimized Skirt Coating — Low-friction skirt treatment reduces parasitic drag during break-in and throughout the piston's service life.

What's Included

• 1x Manley Forged Dish Piston (Grade A) — 86mm STD Bore
• Note: Piston rings, wrist pin, and clips are sold separately unless otherwise specified

Specifications

Fitment & Compatibility

This Manley forged piston is engineered exclusively for the 2015 and newer Subaru WRX equipped with the FA20F turbocharged flat-four engine. It is designed for standard (STD) Grade A bore diameters — meaning the cylinder bore must measure within the factory-spec tolerance range for a proper fit. Always verify your cylinder bore diameter with a bore gauge before ordering. This piston is not compatible with the EJ-series engines (EJ205, EJ257) or the naturally aspirated FA20E found in the BRZ/86 platform.

Compatible Vehicles:

• 2015–2021 Subaru WRX (VA) — FA20F Engine

Is this piston compatible with the Subaru WRX STI? No — the WRX STI uses the EJ257 engine. This piston is designed specifically for the FA20F found in the non-STI WRX.

Installation

Installation of this forged piston requires a full engine teardown and is recommended for experienced engine builders or professional machine shops. Proper cylinder bore measurement (Grade A tolerance verification), piston-to-wall clearance confirmation, ring end-gap filing, and torque-to-yield fastener replacement are all critical steps. A professional engine build is strongly recommended to ensure longevity and proper sealing. Always consult Manley's published clearance specifications before final assembly.