Subaru fans have been eagerly awaiting the return of a high-performance STI hatchback, and recent patent filings from the Japan Patent Office have intensified speculation. The documents, discovered on the Japan Platform for Patent Information, depict a widebody hatchback strikingly similar to the Subaru Performance-B STI Concept unveiled at the 2025 Japan Mobility Show.
Design Details & Timing
The patented design includes WRX-sourced headlights, a redesigned grille, and prominent aerodynamic features. While minor differences exist – notably the absence of vents near the hood scoop and rear exhaust pipes – these are likely standard simplifications for patent applications. The timing is significant: the patents were filed just one month before the concept car’s debut, strongly suggesting they protect the design of the concept itself.
The company also filed similar patents for the all-electric Subaru Performance-E STI Concept on the same day, reinforcing the practice of securing design protection for future models before public release. This is a standard legal procedure to prevent unauthorized replication.
Racing Roots & Engine Specs
The renewed interest in an STI hatchback aligns with Subaru’s HiPerfX2 racing program. This vehicle, essentially a track-focused version of the Performance-B STI Concept, will compete in Japan’s Super Taikyu series as a rolling development platform. The race car utilizes a motorsport-tuned 2.4-liter turbocharged boxer engine generating 359 horsepower, paired with a six-speed manual transmission and all-wheel drive.
This suggests Subaru is actively refining the STI’s performance capabilities in a real-world setting, potentially paving the way for a production version.
Lineup Shifts & Potential Production
Subaru’s decision to discontinue orders for the WRX sedan, Levorg, and Layback wagons in Japan creates an opening in their lineup. The removal of the STI Sport trim from the WRX range further fuels speculation, as it may signal a strategic move to clear space for a more potent STI model.
“The patent filings, combined with racing development and lineup adjustments, indicate Subaru is serious about reviving the STI badge on a hot hatch.”
While official confirmation remains elusive, the convergence of these factors suggests the possibility of a 2027 production model is growing. The company’s deliberate actions suggest they’re carefully preparing for a significant shift in their performance vehicle strategy.
The wait continues, but the evidence points to a potential return of the iconic WRX STI hatchback.
