What engine does the Subaru Impreza WRX STI use?

[MilesMarie]

Subaru Impreza WRX STI uses a 2.5-liter turbocharged horizontally opposed four-cylinder engine and a 2.0-liter turbocharged horizontally opposed four-cylinder engine. Both engines are equipped with multi-point fuel injection technology and feature aluminum alloy cylinder heads and blocks. Both engines are paired with a 6-speed manual transmission. The dimensions of the Subaru Impreza WRX STI are 4580mm in length, 1795mm in width, and 1470mm in height, with a wheelbase of 2625mm. The Subaru Impreza WRX STI features blackened headlights, a sportier mesh grille replacing the standard version's slatted grille, a prominent air intake on the hood indicating its turbocharged nature, a larger lower air intake on the front bumper, fog lights adorned with chrome rings, and air ducts on both sides of the front bumper that provide ample cooling air to the intercooler.

[VonGianna]

The heart of the Subaru Impreza WRX STI is a horizontally opposed turbocharged engine. The classic models are typically equipped with the EJ257, a 2.5-liter four-cylinder design that delivers around 300 horsepower. Having been into cars for over a decade, I can attest that this engine’s ultra-low center of gravity makes the car rock-solid through corners, with exhilarating acceleration on the track or mountain roads. Paired with a six-speed manual transmission and full-time all-wheel drive, it’s a perfect combination. However, be warned—this engine isn’t exactly fuel-efficient, often exceeding 10L/100km in city driving, and it’s prone to knocking issues, so regular oil and coolant changes are crucial. In recent years, the STI may have upgraded to the new FA24 engine, improving fuel efficiency and reliability, but the core driving experience remains thrilling. If you’re drawn to mechanical brilliance, this design is worth diving deep into.

[DeNova]

I just got a used WRX STI with a 2.5T horizontally opposed engine. The exhilarating rumble when driving and the instant thrust at takeoff really get the adrenaline pumping. Daily commuting consumes quite a bit of fuel, and the tank empties quickly, but on weekend mountain runs, you can really feel the handling limits. Maintenance costs aren't low—once I neglected an oil change, and the engine started vibrating more, so I rushed it in for service. Now I've made it a habit to check for oil leaks under the chassis, as this layout is prone to minor issues. The engine paired with the all-wheel-drive system makes winter driving much safer, staying rock-solid even in snow. Overall, it's an exciting choice, just be prepared with a solid maintenance budget—it's totally worth the drive.

[ArcherAnn]

I'm obsessed with automotive history. The Subaru Impreza WRX STI's engine traces its roots back to the rally racing legends of the 1990s, using the EJ257 model - a 2.5-liter turbocharged engine producing around 300 horsepower. This design stems from the brand's proprietary technology, with its horizontally opposed layout lowering the center of gravity and enhancing track handling. Over the years, it has gradually evolved and may transition to the new FA24 engine to meet environmental standards. The engine is paired with a full-time all-wheel-drive system, driving the joy of driving.