Subaru FA20 DIT Turbo Short Block Engine For 2015-21 WRX

Specifications

Part Details:

The Subaru OEM FA20 DIT Turbo Short Block is a brand-new factory engine assembly designed as a direct replacement for 2015–2021 Subaru WRX models equipped with the FA20 DIT engine. Built by Fuji Heavy Industries (FHI), this short block restores original performance, fitment, and reliability for vehicles with worn, damaged, or high-mileage engines.

As a genuine OEM assembly, this short block is ideal for stock or lightly modified WRX builds that require factory-level quality without the complexity or cost of a performance-oriented engine build.

OEM Construction & Quality

This FA20 DIT short block is assembled by Subaru using OEM-spec components throughout. It includes factory pistons, connecting rods, crankshaft, and bearings, all built to Subaru’s original specifications and tolerances.

Because it is assembled directly by the manufacturer, this short block provides proper clearances, consistent quality, and perfect compatibility with factory cylinder heads and accessories.

Performance & Intended Use

The OEM FA20 DIT short block is designed to support stock power levels and mild performance upgrades. It is well-suited for daily-driven WRXs, vehicles undergoing engine replacement due to wear or failure, and builds that prioritize reliability and longevity over increased horsepower.

This short block is not intended for high-boost, big-turbo, or aggressive tuning applications where reinforced or closed-deck performance short blocks would be required.

Vehicle Fitment Overview

This short block is designed specifically for Subaru WRX models equipped with the FA20 DIT engine. Full year-by-year compatibility is listed in the Vehicle Fitment tab above.

As an OEM replacement, this short block is intended to work with factory components and configurations. Vehicle condition, supporting components, and intended use should always be considered prior to installation.

What’s Included

• Brand-new OEM Subaru FA20 DIT engine case halves
• OEM Subaru pistons
• OEM Subaru connecting rods
• OEM Subaru crankshaft
• OEM Subaru rod and main bearings
• Fully assembled short block from the manufacturer

Installation & Build Notes

• Direct replacement for factory FA20 DIT short blocks
• Professional installation is recommended
• Compatible with stock and lightly modified setups
• ECU calibration should be verified after installation
• Not intended for high-boost or extreme performance applications

Recommended Supporting Upgrades

• Air / Oil Separator (AOS)– helps reduce oil vapor ingestion and protect the intake system
• Oil pickup and baffle upgrades – improves oil control and reduces bearing failure risk
• Long block installation kits – simplifies installation with required gaskets and hardware
• Engine installation fluid kits – includes break-in oil and coolant for first startup

Learn more about IAG Performance engine and reliability solutions