Used Subaru Wrx Sti Engines For Sale

Subaru WRX STI Engine

The Subaru WRX STI engine is one of the most recognizable performance powerplants in the used car market. Built around Subaru's signature horizontally-opposed boxer layout, the Subaru STI engine has used two core engine platforms across its generations the EJ257 2.5-liter turbocharged H4 in models from 2004 through 2021, and the FA20 2.0-liter turbocharged H4 in select international variants. Both are high-output, intercooled engines developed directly from Subaru's World Rally Championship program. Whether you're replacing a worn unit or upgrading a project build, a low-mileage Subaru STI engine for sale holds genuine value for owners who want factory performance without the cost of a new crate motor.

About the WRX STI Engine —EJ257 and FA20

The EJ257 is the engine most buyers mean when they search for a used WRX STI engine. It is a 2.5-liter twin-scroll turbocharged boxer producing between 305 and 310 horsepower depending on model year, with 290 lb-ft of torque, forged internal components, and an open-deck block design engineered for high-boost reliability. Subaru used the EJ257 in the STI from 2004 through 2021 — the longest single-engine run in the model's history — which means parts availability, aftermarket support, and quality used units are strong across all years.

The FA20 engine, while used in the base WRX from 2015 onward, did not replace the EJ257 in the STI for the U.S. market during this period. If you are sourcing a replacement engine for a U.S.-spec STI, you are almost certainly looking for the EJ257.

WRX STI engine vs WRX engine

Many of us assume the WRX STI and WRX share the same engine — after all, they wear the same Subaru badge and look nearly identical on the outside. But pop the hood and the story changes completely. The WRX STI engine and the WRX engine are built on different foundations, tuned for different purposes, and are not interchangeable under any circumstance.
The WRX STI engine is the EJ257 — a 2.5L turbocharged boxer four with forged internals, a reinforced bottom end, and 305 hp stock. The WRX engine, on the other hand, is either the EJ255 (older models) or the FA20DIT (2015 onwards) — smaller, lighter, and tuned for daily efficiency over performance. Different mounts, different ECU mapping, different supporting hardware. If you are replacing your STI engine, ordering a WRX engine by mistake is a costly error — always verify your engine code against your VIN before purchasing.

Used WRX STI engine from Turbo AutoParts

Turbo AutoParts provides used WRX STI engines that are thoroughly inspected, low-mileage, and ready to drop into your build. Every used engine we sell is Grade A rated meaning it passes compression testing, leak inspection, and a full mechanical check before listing. We stock the EJ257 2.5L turbocharged engine across 2014–2021 model years, so finding the right fitment for your Subaru is fast and straightforward. With free shipping, flexible financing, and a 3-year / 30,000-mile warranty, Turbo AutoParts is the trusted source for Subaru owners who want quality without overpaying.

Frequently Asked Questions

Is the WRX STI engine the same as the WRX engine?

No. The STI uses the EJ257 (2.5L turbo), while the WRX runs the EJ255 or FA20DIT — different displacement, internals, and power output. They are not interchangeable. Always confirm the engine code matches your VIN before ordering.

What mileage is acceptable for a used EJ257?

Under 50,000 miles is the sweet spot for a used EJ257. All our listings are Grade A — compression-tested and inspected before sale — and backed by a 3-year / 30,000-mile warranty for added peace of mind.

Does a used STI engine come with accessories (turbo, manifold, sensors)?

Included accessories vary by listing each product page specifies exactly what's in the box. If you need the turbo, manifolds, or sensors bundled, call us at (888) 618-8881 before ordering and we'll confirm what's available.

How long does shipping take?

Most orders arrive within 3–7 business days after processing. Shipping is free to a commercial address — have your mechanic's shop address ready at checkout. You'll receive a tracking number by email once the engine ships.

What do I need for installation?

Plan for 10–16 hours of labor at a Subaru-experienced shop. Replace the timing belt, water pump, and seals while the engine is out. Need an installer? Call us and we'll connect you with a verified mechanic in your area.