Next Level Performance
September 19, 2026 • 9 min read
The Roush 2026 Mustang supercharger is here, and it resets the ceiling for the seventh-generation (S650) Ford Mustang: 810 horsepower and 630 lb-ft of torque from a single, 50-state-legal bolt-on kit. Announced in mid-2026 and now shipping, this is the first factory-backed forced-induction system engineered specifically for the 2024–2026 Mustang GT and Dark Horse 5.0L Coyote — and at our Tampa, FL shop we already have builders lining up to run it over the off-season. Below we break down exactly what makes it a genuine 810 hp kit, how it compares to the proven S550 blowers it replaces, and why the cold months are the right window to bolt one on.
Our Verdict
The Roush 2026 Mustang Supercharger is the first bolt-on 810 HP kit engineered for the S650 5.0L Coyote — and winter is the smartest time to install it.
Roush’s inverted Eaton TVS R2650 system turns a 480-horsepower 2024–2026 Mustang GT or Dark Horse into an 810 hp, 630 lb-ft street car that stays 50-state legal, fits under the factory hood, and carries a Roush limited parts warranty. It is the highest-power, easiest-to-live-with blower we stock for the new-generation Mustang.
Shop Our Top Pick →What Is the Roush 2026 Mustang Supercharger?
The Roush 2026 Mustang supercharger (part number RSH422350) is a complete, calibration-included positive-displacement blower system that raises a stock S650 Mustang GT to 810 hp and 630 lb-ft of torque. It is a Phase 2 kit built around an inverted Eaton TVS R2650 rotor pack — the same 2.65-liter-per-revolution displacement class used on the outgoing S550 kits, but repackaged for the new car with a front-inlet, front-drive layout co-developed with Magnuson Superchargers.
In plain terms: a supercharger is an engine-driven air pump that force-feeds the motor more oxygen so it can burn more fuel and make more power. The Roush unit is a roots-style, twin-screw TVS blower, which means it builds boost the instant you touch the throttle — no turbo lag, no waiting for the tach to climb. Because Roush ships the kit with its own SAE-verified 810 hp calibration and E.O.-approved hardware, it is legal for sale and installation in California and every other emissions state, something no turbo kit on this platform can claim yet.
Roush 2026 Mustang 810 HP supercharger — RSH422350, in stock at NLP Performance.
How Much Power Does the 810 HP Roush Kit Make?
The Roush 2026 kit is rated at 810 horsepower and 630 lb-ft of torque at the crank, generating up to 13 psi of peak boost at 7,500 rpm. On a 2024–2026 Mustang GT that leaves the factory rated at 480 hp (486 hp with the active-valve exhaust) and 415 lb-ft, that is a gain of roughly 330 horsepower — a 69% increase — from a single bolt-on system. Dark Horse owners starting at 500 hp see a similar jump while keeping the model’s upgraded oil cooler and Tremec manual.
What makes the number believable is how Roush delivers it. The inverted rotor design places the supercharger inlet at the front, which opens room for a larger, more efficient air-to-water intercooler. Cooler intake air means the tune can hold timing and make consistent power pull after pull, even in Florida heat — the same reason it will feel even stronger in cold winter air, when denser intake charge naturally supports more boost. Four-lobe rotors twisted at 170 degrees also let the blower pull cleanly to redline instead of falling off up top.
The inverted TVS R2650 blower frees up space for a larger air-to-water intercooler.
Inverted TVS R2650: What Is New for the S650?
The headline engineering change is packaging. Roush reuses the S650’s factory dual 80mm throttle bodies rather than swapping to a single large throttle body, preserving the clean, symmetrical OEM engine-bay appearance and delivering up to 34% more throttle area than typical single-throttle competitor kits. More throttle area means the engine can actually breathe the extra air the blower is moving.
Every component is designed to fit under the stock hood and factory K-brace with no cutting or panel modification, which keeps installation approachable for a competent home mechanic and preserves the car’s crash structure. Roush backs the system with a limited parts warranty, and because the hardware carries a CARB Executive Order (E.O.) number, adding it will not automatically fail a smog check in emissions-tested states — a real consideration for a daily-driven Mustang. In our experience, that combination of factory-look packaging, legal status, and a supplied calibration is exactly what separates a weekend science project from a car you can trust on a winter road trip.
Everything fits under the stock hood and K-brace — no body modifications required.
Roush 810 HP vs the Proven S550 Mustang Blower Kits
If you own an older Mustang, the same shelf that holds the new S650 kit also holds the blowers that built the S550’s reputation. The table below lines up the Roush 2026 810 hp system against the three most popular Coyote supercharger kits we stock for 2015–2021 cars — two positive-displacement roots units and one centrifugal race kit — so you can match the right kit to your exact model year and power goal.
| Kit | Blower Type | Rated Output | Fits | Price |
|---|---|---|---|---|
| Roush 2026 R2650 Phase 2Top Pick | Inverted Eaton TVS R2650 (roots) | 810 hp / 630 lb-ft | 2024–2026 GT & Dark Horse | $10,399.00 |
| Edelbrock E-Force Stage II | Eaton R2650 (roots) | 686 hp / 533 lb-ft | 2018–2019 GT (S550) | $11,995.95 |
| Roush Phase 2 (R2300) | Eaton TVS R2300 (roots) | Up to 727 hp / 610 lb-ft | 2015–2017 GT (S550) | $8,499.99 |
| KraftWerks Race (C38-92) | Rotrex (centrifugal) | 500+ rwhp | 2018–2021 GT (S550) | $5,454.32 |
Roush and Edelbrock quote SAE crank (flywheel) horsepower; KraftWerks quotes dyno-verified rear-wheel horsepower, which typically reads about 15% lower than crank. Match the kit to your exact year — the S650 Roush kit does not fit S550 cars, and vice versa.
The takeaway: for a new-generation 2024–2026 car, the Roush 810 hp kit is the only complete, legal option on this list and the clear top pick, priced around $10,400. If you drive a 2018–2019 GT and want maximum roots-style grunt, Edelbrock’s Stage II is the highest-output 50-state-legal S550 kit at 686 hp. The 2015–2017 Roush Phase 2 remains a value-leading 700-plus-horsepower roots system near $8,500, while the KraftWerks Rotrex kit is the centrifugal choice around $5,500 for builders chasing big top-end and a linear pull. Full pricing and fitment for each live on the product pages below.
Edelbrock’s R2650 blower uses a dual-pass, three-core (DP3C) air-to-water intercooler to cool the charge.
Why Winter Is the Right Time to Add 810 HP
Installing a supercharger is an off-season project, and there are three practical reasons to do it now. First, downtime: a blower install, break-in, and dial-in takes a car off the road for a stretch, and losing your Mustang for a week in January stings a lot less than losing it on a perfect spring weekend. Second, safety: 810 horsepower and cold, wet, low-traction winter roads are a bad mix, so the off-season lets the car sit while you complete the build, upgrade tires, and be ready to enjoy the power responsibly when grip returns.
Third — and this is the fun part — forced-induction engines love cold, dense air. The same kit that makes 810 hp in the Florida summer will feel even more urgent on a crisp 40-degree morning, because denser intake charge packs more oxygen into every cylinder. Build it over the winter, and the first warm dry day of spring is a payoff, not a project. If your Mustang is a garaged weekend car, pair the install with a battery tender and a quality car cover so it wakes up healthy and ready to boost. We keep the full line of superchargers, tuners, and supporting mods in stock in Tampa to knock the whole build out in one off-season window.
The complete Roush 2026 kit — blower, intercooler system, calibration, and hardware — ready for an off-season build.
The Best Mustang Supercharger Kits at NLP Performance
Here are the four Mustang supercharger kits featured above, with live pricing and fitment. Every kit ships with the core blower, intercooler system, and hardware; Roush and the Edelbrock w/-tune kits include calibration, while no-tune versions require a supported tuner. Confirm your exact year, trim, and transmission on the product page before ordering.
Key Specifications — Roush 2026 810 HP Kit
Roush 2026 810 HP Kit: Pros and Cons
What We Like
- + 810 hp / 630 lb-ft — the highest bolt-on power available for the S650 Mustang
- + 50-state legal with a CARB E.O. number, so it passes emissions testing
- + Instant roots-style boost with no lag; fits under the stock hood with no cutting
- + Includes Roush calibration and a limited parts warranty
Things to Consider
- – Around $10,400 plus install — a serious investment
- – 810 hp on a rear-drive car demands upgraded tires and a careful, sober right foot
- – S650-specific — it does not fit 2015–2023 (S550) Mustangs
Frequently Asked Questions
How much horsepower does the Roush 2026 Mustang supercharger add?
The Roush 2026 Mustang supercharger takes a stock S650 Mustang GT to 810 horsepower and 630 lb-ft of torque. That is roughly a 330-horsepower gain over the factory 480 hp rating — about a 69% increase — from a single bolt-on kit running up to 13 psi of boost.
Does the Roush 810 HP supercharger fit the 2024 and 2025 Mustang?
Yes. The Roush 810 HP kit (RSH422350) is engineered for the 2024, 2025, and 2026 Mustang GT and Dark Horse with the 5.0L Coyote V8. It does not fit 2015–2023 (S550) Mustangs; those cars use the separate Edelbrock, Roush Phase 2, or KraftWerks S550 kits.
Is the Roush 2026 Mustang supercharger 50-state legal?
Yes. The Roush 2026 supercharger carries a CARB Executive Order (E.O.) number, making it legal for sale and installation in California and all other emissions states. It will not automatically fail a smog check, which is unusual for a power adder of this size.
Is a supercharger better than a turbo for the Mustang?
For a street-driven Mustang, a roots-style supercharger like the Roush kit delivers instant, lag-free boost the moment you touch the throttle and is far simpler to install and keep emissions-legal. Turbos can make more peak power but add heat, complexity, and lag, and no S650 turbo kit is currently 50-state legal.
Why install a supercharger in the winter off-season?
Winter is the ideal time because the car is off the road less painfully, you can complete the install and tire upgrades before spring, and forced-induction engines make stronger, more consistent power in cold, dense air. Building over the off-season means the first warm day is for driving, not wrenching.
How much does the Roush 2026 Mustang supercharger cost?
The Roush 2026 Mustang 810 HP supercharger kit is priced around $10,400 at NLP Performance, plus professional installation. Proven S550 kits for 2015–2021 Mustangs range from about $5,500 for the KraftWerks centrifugal kit up to roughly $12,000 for the Edelbrock E-Force Stage II.
Build Your 810 HP Mustang This Off-Season
Shop the Roush 2026 kit and every Mustang supercharger, tuner, and supporting mod at NLP Performance.
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