Subaru’s flat-six is back for the 2026 season, but not in a production road car: the BRZ GT300 race car competing in SUPER GT’s GT300 class has replaced its long-serving EJ20 flat-four with a newly developed 3.0-liter twin-turbo flat-six. Subaru identifies the competition engine as “EG33改,” based on the EG33 associated with the Alcyone SVX. The announcement is a racing-program development, not confirmation of a road-car engine return.
What is back—and where?
Subaru says the BRZ GT300’s EJ20 completed its run in 2025 and that a newly developed 3.0-liter horizontally opposed six-cylinder twin-turbo engine will power the car for 2026. The application is a competition car in SUPER GT’s GT300 class. Subaru has not announced that this engine will be offered in a production vehicle.
Subaru’s vehicle library lists the race car’s engine displacement as 2,932 cc and its maximum output as more than 500 PS at 7,000 rpm. These are race-car specifications, not specifications for a road-going BRZ or an available replacement engine. Subaru does not publish a torque figure in that entry.
2026 BRZ GT300 engine and car specifications
| Item | Published information |
|---|---|
| Application | 2026 Subaru BRZ GT300, SUPER GT GT300 class |
| Engine | EG33-based, newly developed flat-six (“EG33改”) |
| Induction | Twin-turbocharged |
| Displacement | 2,932 cc |
| Published maximum output | More than 500 PS at 7,000 rpm |
| Drivetrain and gearbox | Front-engine, rear-wheel drive; six-speed Hewland sequential gearbox with reverse |
Specifications are from Subaru’s vehicle library. They describe the race car, not a consumer model.
How it connects to the SVX
The lineage reaches back to Subaru’s Alcyone. Subaru’s official history says the Alcyone gained the company’s first horizontally opposed six-cylinder engine, a 2.7-liter unit, in 1987. The later Alcyone SVX used the EG33, and Subaru describes the 2026 race engine as based on that engine.
“Based on” does not mean the old road-car engine has simply been put back into service. Subaru calls the new unit newly developed and race-tuned. The “EG33改” designation signals the lineage while distinguishing the competition engine.
What is different from the outgoing EJ20?
The change is from the BRZ GT300’s long-serving EJ20 flat-four to an EG33-based flat-six with twin turbochargers. Subaru’s announcement presents the new engine as part of the team’s effort to improve performance and competitiveness. Those are goals, not proof of a season-long result.
| Comparison | Outgoing engine | 2026 engine |
|---|---|---|
| Layout | EJ20 flat-four | EG33-based flat-six |
| Induction | Turbocharged | Twin-turbocharged |
| Application | BRZ GT300 through the 2025 season | BRZ GT300 for 2026 |
| Published displacement | Not stated in the cited 2026 vehicle-library entry | 2,932 cc |
Subaru’s February 2026 shakedown report describes development work that included the intercooler layout and front aerodynamics. The report treats reliability as a development aim, not an already established outcome.
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Development is still part of the story
Subaru’s August 2026 Fuji report shows that the new package was still being developed during the season, including work on cooling and setup. For that event, a Balance of Performance adjustment reduced permitted turbo boost; Subaru’s report says boost in the power band was reduced by roughly 8 percent. That was an event-specific adjustment, not a permanent engine specification.
The BRZ GT300 finished 28th at Fuji after a late tire failure, according to Subaru’s event report. That single race is context for the development process, not a verdict on the entire season.
Is Subaru bringing back the flat-six for road cars?
The cited announcements and specifications concern the BRZ GT300 competition car. They do not confirm a production-car launch, a road-car engine option, or a consumer retrofit. Until Subaru announces a road-going application, the careful answer is that the flat-six has returned to Subaru racing, not Subaru’s showroom.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.FAQ
What engine is in the 2026 Subaru BRZ GT300?
It uses a newly developed, EG33-based 3.0-liter twin-turbo flat-six. Subaru’s vehicle library lists its displacement as 2,932 cc.
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Is the new Subaru flat-six going into a production car?
No production-car application is established by the cited Subaru announcements. The announced engine is for the BRZ GT300 race car.
Is the BRZ GT300 flat-six based on the SVX engine?
Yes. Subaru identifies the race engine as EG33-based; the EG33 was used in the Alcyone SVX. The new competition engine is described as newly developed, so it should not be treated as an unchanged production EG33.
How much power does the 2026 BRZ GT300 engine make?
Subaru’s vehicle library lists more than 500 PS at 7,000 rpm. This is the published specification for the race car; Subaru does not list a torque figure there.
Did Subaru permanently reduce the engine’s boost?
Subaru reported a Balance of Performance boost reduction for the Fuji event. That was a race-specific adjustment, not a permanent engine specification.
Quick Recap
Sources
- SUBARU, official history of the Alcyone and its 1987 2.7-liter flat-six (c001).
- Subaru Corporation, 2026 activity release announcing the BRZ GT300 engine change (c002).
- SUBARU vehicle library, BRZ GT300 specifications (c003).
- SUBARU/STI Motorsport, February 2026 shakedown report (c004).
- SUBARU/STI Motorsport, August 2026 Fuji race report (c005).
- SUPER GT official site, independent series information on the engine lineage and replacement (c006).
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