The trail of breadcrumbs pointing to the return of a proper Subaru STI has been an entertaining one to follow. Shortly after the company put its new racing hatchback through testing, a set of patent drawings surfaced online, fueling more speculation about a potential production version.

The patents, filed at the Japan Patent Office, depict a Subaru hatchback with a wide body kit, WRX-sourced headlights, a new grille, and prominent aero components. It looks nearly identical to the Performance-B STI Concept from the 2025 Japan Mobility Show.

More: Subaru Says STI Is “Not Dead”, But Its Boxer May Be

A closer look reveals only minor differences, namely the absence of extra vents on either side of the signature hood scoop and the lack of tailpipes at the rear. The latter likely relates to the patent application itself, much like the blank wheels and simplified lighting details.

Concept Design Captured In Patents

Japan Platform for Patent Information

As reported by Top Gear Philippines, which spotted the filing on the Japan Platform for Patent Information, the documents were submitted on September 29, 2025, one month before the show car’s debut on October 30. The timing, combined with the near-perfect visual match, strongly suggest these drawings depict the Subaru Performance-B STI Concept rather than a rumored 2027 production model.

More: Subaru Showed Four New STI Models, And Not Even One’s A Real STI

A quick search of the same database shows that similar patents for the Subaru Performance-E STI Concept were filed on the very same day. They replicate the fully electric fastback’s design without any changes. This is standard practice, as automakers routinely secure design protection for both concepts cars and future production models ahead of their public debut to prevent copyright issues.

What About The Rumors?

While these patents likely exist for legal reasons, the timing of their discovery is what has enthusiasts paying attention. Subaru’s HiPerfX2 hatchback, essentially the racing counterpart to the Performance-B STI Concept, is set to compete in Japan’s Super Taikyu series, where it will double as a rolling development lab.

More: Subaru’s WRX STI Hatch Is Back On Track, Just Not On The Street

The race car pulls together an assortment of WRX STI sedan components, wrapped in a widebody hatchback silhouette that appears to draw from the Impreza. Under the hood sits a motorsport-tuned version of the turbocharged 2.4-liter boxer engine, producing 359 hp (268 kW / 364 PS), paired with a six-speed manual gearbox and an all-wheel-drive system.

Subaru Performance-B STI Concept

Talk of a 2027 return for the WRX STI hatchback starts to make more sense when you look at the gaps forming in Subaru’s current lineup. The company has confirmed it will stop taking orders for the WRX sedan in Japan, along with the Levorg and Layback wagons, leaving some notable space to fill.

Another telling move is the removal of the STI Sport grade from the WRX range, which could be less about trimming options and more about clearing the stage for something more exciting with the STI badge.

Whether this all points to a routine model year reshuffle or a deeper generational reset, one that finally brings the STI badge back to a hot hatch, is still an open question.

Subaru Performance-E STI Concept

The last proper Subaru WRX STI bowed out in 2021, and it left a crater in the brand’s performance lineup. Since then, Subaru Tecnica International loyalists have been clinging to hope for something new. According to company officials, that hope is not misplaced. The high-performance division is “not dead,” and there is apparently plenty going on behind closed doors.

Over the past few years, Japanese buyers have had to settle for STI Sport editions of the WRX, Levorg, and Forester. Nice cars, certainly. But the real headline-grabbers were the two STI concepts unveiled at the 2025 Tokyo Motor Show.

More: Subaru Showed Four New STI Models, And Not Even One’s A Real STI

Scott Lawrence, General Manager of Subaru Australia, spoke to Drive.com.au about those concepts and the broader direction of the STI sub-brand:

“There has been a significant volume of feedback,” he said. “The tempo of news and activity out of STI publicly is picking up. It has the most vocal followers of the Subaru camp, put it that way. As those concepts proved, lots of work in that space – STI isn’t dead.”

Testing The Waters

Subaru is using its latest STI concepts to measure enthusiast appetite and, more importantly, to justify the next halo car. The fully electric Performance-E STI looks like nothing else in the current lineup. At the same time, the gasoline-powered Performance-B STI is essentially a heavily reworked Impreza hatchback with a serious gym habit.

More: Subaru Made Two STIs And Now It’s Asking You To Choose

Initially, Subaru implied that fans would help decide which concept makes it to production. That democratic spirit now appears to have limits. The EV seems to have the inside track. According to the report, Subaru has confirmed the Performance-B will remain a concept, while staying carefully noncommittal about the Performance-E’s future.

The Fastest Current Subaru Isn’t An STI

While we wait for a proper STI to reappear, the Trailseeker, Subaru’s electric alternative to the Outback, has become the quickest thing in the showroom. Not exactly the plot twist purists were hoping for. Its dual-motor setup delivers a combined 375 hp (280 kW), good for a 0-60 mph sprint in 4.4 seconds, although in our testing the crossover wagon managed to dip even lower.

Review: The 2026 Subaru Trailseeker Is An Insanely Fast Wagon That Just Happens To Be Electric

If you still prefer your performance with a sedan shape, the coolest kids on the block are the limited production S210 from last year, and the current STI Sport#, both based on the WRX. The latter debuted earlier this year with a six-speed manual gearbox, STI-tuned electronically controlled dampers by ZF, Brembo brakes with gold calipers, and 271 hp (202 kW) from the standard 2.4-liter boxer engine.

Subaru is clearly feeling its way toward whatever comes next for the STI sub-brand. Hybrid, fully electric, or something in between is still undecided. What seems less negotiable is the badge itself. It is sticking around, even if the boxer engine eventually is not.