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Genuine HKS piston kit. Manufacturer part number - 21003-AF002.
FITMENT AND SPECIFICATIONS
| Vehicle | Engine | Type | Displacement (mm) | Size | Boring・Honing modification | Full flow modification | Compression Ratio | Code No. | Remarks |
|---|---|---|---|---|---|---|---|---|---|
| WRX STI | EJ20 | Forging Piston Kit | 2016 | φ92.5-φ23 | Required | Not required | GK t=0.7 ε=8.0 | 21003-AF002 | Nickel Plating, Molybdenum Coating |
| IMPREZA WRX STI | EJ20 | Forging Piston Kit | 2016 | φ92.5-φ23 | Required | Not required | GK t=1.4 ε=8.0[GC8ver.III~VI]/GK t=0.7 ε=8.1[GDB・BE5] | 21003-AF002 | Nickel Plating, Molybdenum Coating |
Match the engine, chassis, transmission and all application restrictions before ordering.
PURCHASED PARTS PACKAGE
One HKS piston kit under part number 21003-AF002. See the application table for the supplied specification and separately required parts. This is a piston kit, not a complete stroker kit.
INSTALLATION AND OPTIONS
Professional installation and the manufacturer application instructions are required. The image is a manufacturer product-family illustration. The supplied components and dimensions follow the part number and table above.

HKS 92.5mm Piston Kit for Subaru EJ20 - 21003-AF002

