Subaru has finally unveiled a nearly complete version of the long-awaited WRX STI, based on the current-generation WRX Sedan, at the Tokyo Auto Salon 2025. The new model, officially called the STI Complete Car S210 Prototype, serves as a successor to the rare and highly sought-after WRX STI S209. While Subaru has previously rolled out models that flirted with the STI moniker, this prototype brings enthusiasts closer than ever to the real deal, though one iconic feature is notably absent: the iconic Driver’s Control Center Differential (DCCD).
Under the hood, the S210 Prototype packs a reworked version of the WRX’s 2.4-liter turbocharged FA24 engine. With a target output of 296 horsepower and 277 lb-ft of torque, it offers a notable boost over the standard WRX, courtesy of a refined ECU and a suite of performance upgrades. These include a redesigned air cleaner, intake ducts, pre-turbo ducts, and a low back pressure exhaust system featuring a unique cannonball-shaped chamber for reduced resistance.
Subaru has equipped the S210 with the Subaru Performance Transmission, marking the first time an S-series model features a continuously variable transmission (CVT). This unit has been meticulously tuned for sharp and responsive “gearshifts,” aimed at delivering an exhilarating driving experience.
However, the absence of a limited-slip differential—a hallmark of traditional STIs—may disappoint purists. Instead, Subaru has incorporated specially tuned electronic dampers, revised coil springs, and newly developed rear stabilizer bushes to enhance handling. Brembo-sourced braking components, including 6-pot front calipers, specialized pads, and drilled rotors, complete the package.
Visually, the S210 Prototype exudes racing pedigree, borrowing aerodynamic cues from Subaru’s endurance racecars. STI-branded carbon fiber aero parts, a dry carbon rear spoiler, and 19-inch BBS wheels wrapped in Michelin tires contribute to its aggressive stance.
Inside, the cabin is a blend of luxury and sportiness, featuring Recaro 8-way power seats with carbon-fiber backrests and a sleek black interior punctuated by red accents. Subaru has taken care to align the S210’s aesthetics with its racing DNA, while maintaining everyday usability.
The WRX STI S210 Prototype is slated for production, with Subaru promising additional details in the spring. Like its predecessor, the S210 will be limited to just 500 units worldwide, raising questions about its availability outside Japan.
While the absence of the DCCD and the use of CVT in an STI might make it feel less like a traditional STI, the S210 offers a glimpse into the evolution of Subaru’s performance division—for better or worse. Let’s just hope a much more widely available STI with more power arrives to give Subaru a needed boost.
