There is no official "2026 Mustang GT390" in the current Ford lineup. The "GT390" nameplate is a historical reference to the classic 1960s Mustang models powered by the 390 cubic-inch (6.4L) V8 engine, famously associated with the movie Bullitt.
It is possible that you are seeing custom builds, aftermarket tributes, or perhaps confusing it with the high-performance variants that are available for the 2026 model year. Here is a breakdown of the actual 2026 Ford Mustang lineup:
2026 Ford Mustang Trim Levels
EcoBoost®: Powered by a 2.3L turbocharged I-4 engine producing 315 horsepower and 350 lb-ft of torque.
GT: Features the 5.0L Ti-VCT Coyote™ V8 engine, delivering 480 horsepower and 415 lb-ft of torque.
Dark Horse®: A track-focused trim with a modified 5.0L Coyote™ V8 pushing 500 horsepower, paired with a TREMEC® 6-speed manual transmission.
Dark Horse SC: A new, top-tier model for 2026 featuring a supercharged 5.2L V8 engine producing 795–800 horsepower.
Mustang GTD: An ultra-high-performance, race-derived supercar with a supercharged 5.2L V8 that produces 815 horsepower and is designed for track dominance, including a Nürburgring-tested aerodynamic package.
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