Ford may already offer the 795-horsepower Mustang Dark Horse SC, but Roush Performance believes it can deliver even bigger numbers at a much lower price. The company has officially revealed a new supercharger package for the 2026 Mustang GT and Dark Horse that pushes the 5.0-liter Coyote V8 to a claimed 810 horsepower.
Perhaps even more importantly for buyers in emissions-heavy states, the system is fully 50-state CARB compliant. That means owners in places like California can legally register and drive the upgraded Mustang without running into emissions certification problems that often plague aftermarket forced-induction setups.
Priced at $10,399 before installation, the kit positions itself as a relatively attainable path to Shelby GT500-level performance using a standard Mustang GT or Dark Horse as the starting point. Roush also says the package was engineered to fit cleanly beneath the factory hood without requiring body modifications or cutting.
For enthusiasts chasing serious horsepower while retaining factory-like drivability and legality, this may end up being one of the most appealing upgrades yet for the S650-generation Mustang.
810 Horsepower From A Stock-Fit Supercharger Setup
At the center of the package is an inverted Eaton TVS R2650 supercharger developed in partnership with Magnuson Superchargers. Unlike many aftermarket blower kits that require extensive modifications for clearance, Roush designed this setup specifically to fit under the stock hood and factory K-brace.
The system uses a front-inlet, front-drive layout that keeps the supercharger low enough to maintain factory-like packaging. According to Roush, no cutting, drilling, or sheetmetal modifications are required during installation.
Peak boost reaches approximately 13 psi at 7,500 rpm. Rather than replacing the factory intake setup with a single oversized throttle body, Roush retained the Mustang’s dual 80mm throttle bodies to preserve throttle response and drivability.
The company says the result is a cleaner, more OEM-style engine bay while still delivering massive gains in power. Final output is rated at 810 horsepower and 630 lb-ft of torque.
Built To Handle Serious Performance
Making that kind of power reliably requires considerably more than simply bolting on a supercharger. Roush upgraded the cooling system with high-efficiency twin intercoolers, a large front-mounted heat exchanger, and a Bosch high-flow intercooler pump designed to maintain stable intake temperatures under repeated hard use.
The fuel system also received substantial upgrades, including high-flow injectors, billet fuel rails, revised fuel director plates, and colder Ford Performance spark plugs optimized for boosted operation.
Roush additionally developed a revised front accessory drive system intended to reduce stress on the crankshaft while optimizing belt routing for the supercharger setup.
The tuner claims the package remains highly streetable despite the extreme power increase. Plug-and-play wiring and OEM-style calibration software are designed to simplify installation and preserve factory-level diagnostics.
It May Be The Budget GT500 Alternative
The timing of the kit is particularly interesting because Ford no longer offers the previous-generation Shelby GT500. For many enthusiasts, the new Roush setup effectively fills that gap by delivering even more horsepower from the current-generation Mustang platform.
The numbers become even more impressive when viewed from a value perspective. A standard Mustang GT starts below $50,000, while the Dark Horse begins around the mid-$60,000 range. Even after adding the Roush kit, buyers could still spend significantly less than the six-figure price tag attached to Ford’s factory-backed Mustang Dark Horse SC.
Performance estimates are equally wild. According to Roush, an S650 Mustang equipped with the package, proper tires, and a prepared surface can launch from 0-60 mph in just 2.88 seconds while completing the quarter mile in approximately 10.33 seconds at 136 mph. Those numbers place the upgraded Mustang firmly into modern supercar territory.
A Street-Legal Monster With Warranty Coverage
One of the biggest selling points may ultimately be legality and warranty support. High-horsepower aftermarket builds often create registration headaches in states with strict emissions laws, especially California.
Roush’s CARB Executive Order approval solves that problem by making the package emissions compliant across all 50 states. The company also backs the setup with a three-year, 36,000-mile limited powertrain warranty.
That combination of warranty protection, factory-style fitment, and nationwide legality could make the kit especially attractive to owners who want massive power without sacrificing usability or reliability.
For the current Mustang generation, the Roush package may represent the closest thing yet to a factory-style Shelby successor. It delivers more than 800 horsepower while retaining street legality, factory refinement, and a relatively approachable overall cost compared to many modern high-performance halo cars.