Roush's New Supercharger Puts 810 Legal Horsepower Under a Stock-Looking Mustang Hood

Roush Performance's new supercharger kit for the 2026 Mustang GT and Dark Horse pushes the 5.0-liter Coyote V8 to 810 horsepower and 630 lb-ft of torque — and does it without a single cut, drill, or body modification. Developed in partnership with Magnuson Superchargers, the kit centers on an inverted Eaton TVS R2650 unit in a front-inlet, front-drive layout that reuses the factory dual 80mm throttle bodies and fits entirely under the stock hood and K-brace.

Peak boost lands at 13 psi at 7,500 rpm, managed by high-efficiency twin intercoolers, a large front-mounted heat exchanger, and a high-flow Bosch PCE intercooler pump to keep intake temperatures in check under sustained load. The system is plug-and-play on the wiring side and uses Roush's own Diagnostic Tool software for OEM-level flash reliability — the kind of installation experience that's historically been rare at this power level.

The bigger news for California buyers specifically: the kit now carries E.O. approval, making it legal for sale and installation in every state that requires an Executive Order number for aftermarket forced induction. That's frequently the sticking point that keeps big-power supercharger kits out of reach for buyers in emissions-strict states, and Roush clearing it removes that barrier entirely.

It retails for $10,399, backed by a 3-year/36,000-mile limited powertrain warranty. For reference, Ford's own in-house option — a Whipple-built kit sold through Ford Racing Parts — makes a similar 810 hp in the Mustang GT and Dark Horse (with active valve exhaust) and 700 hp in the F-150, meaning Mustang buyers now have two 50-state-legal, three-digit-horsepower supercharger paths to choose between at the parts counter.