2025 Subaru S210 Prototype previews a new WRX STI

Subaru has shown the first signs of cracking under pressure to deliver the world a full-fat STI version of the current-generation WRX, having just debuted the S210 Prototype at the Tokyo Auto Salon.

While not officially badged or referred to as a 2025 Subaru WRX STI, the S210 Prototype uses the JDM-spec WRX S4 STI Sport R EX as the donor vehicle for a meaningful power increase, tightened chassis and more menacing visuals – all the traditional hallmarks of a full-fat STI.

Power and torque are rated at 221kW and 375Nm respectively, marking a 19kW improvement over the standard car – JDM WRXs develop more torque than Aussie versions – thanks to high-flow induction and exhaust systems and a corresponding ECU tune.

Unlike previous WRX STIs however which were manual-only affairs, all 500 examples of the production-spec S210 will come exclusively with the Subaru Performance Transmission… a CVT.

Subaru says the transmission has been retuned with a more aggressive shift pattern for its eight simulated ratios and shifts in line with the turbocharged 2.4-litre flat four engine’s elevated outputs.

Missing from the equation is the previous STI’s ‘Driver Controlled Centre Differential’ which altered the torque split between the front and rear axles depending on the conditions and driver’s preference.

Still, the chassis has been tightened up with specially tuned ZF adaptive dampers, new springs and rear stabiliser bushes, an STI strut brace, additional underbody bracing, six-pot Brembo front brake callipers, drilled rotors and lightweight 19-inch forged alloy wheels shod with sticky 255/35-profile Michelin Pilot Sport 4S rubber.

The exterior is defined by the new ‘dry carbon’ rear spoiler inspired by Subaru’s current touring cars as opposed to previous generations of WRX and STI, while other highlights include the full suite of STI cosmetic bits, black trim, a red-trimmed grille and plenty of ‘S210’ badges.

The modded JDM vibes are continued within the cabin by eight-way power-adjustable Recaro carbon bucket front seats (lined with Nappa leather), red stitching, ‘S210’ embroidery and vehicle-specific build plate.

“The S210 is a direct derivative model of the race car that competes on one of the world’s toughest tracks, incorporating technology and knowledge gained from the Nürburgring 24-Hour Race where STI takes on a challenge, and offers maneuverability that allows the driver to control the car at will,” Subaru said.

Outright performance capabilities are yet to be detailed, however more information and official claims should be published in autumn when the S210 goes on sale, exclusively in Japan.

Join the conversation at our Facebook page
Or email us at editor@carsales.com.au