Few cars embody the American performance spirit like the Ford Mustang. Since 1964, it’s stayed true to its roots of delivering power, style, and relatively affordable fun. Over the decades, different generations of the Mustang have introduced groundbreaking features while preserving that distinctive Mustang heritage. In this article, we’ll compare the S550 Mustang (2015–2023) and the S650 Mustang (2024+), highlighting the biggest differences in design, powertrain options, tech, and overall driving experience.
Exterior Design
S550 Mustang (2015–2023)
When the S550 arrived in 2015, it modernized the Mustang’s look with sleeker, more global-friendly styling.
- Sleek Lines: A sharp departure from the retro S197, the S550 is lower, wider, and more aerodynamic.
- Signature Lighting: Tri-bar taillights (now recessed and angled) and a more streamlined front fascia gave it an aggressive stance.
- Overall Shape: Maintained the classic long-hood, short-deck proportions, but smoothed out for improved aerodynamics.
S650 Mustang (2024+)
The S650 builds upon the S550’s foundation while sharpening its aesthetic for the modern era.
- Refined Aggression: The front grille is bolder, the headlights have a narrower, more intense LED design, and the hood creases are more pronounced.
- Aerodynamic Tweaks: Active grille shutters and new underbody panels reduce drag and improve cooling.
- Rear Styling: Taillights preserve the Mustang’s tri-bar identity but appear sleeker, with more angular edges and updated LED accents.
Interior and Technology
S550 Mustang
Inside the S550, Ford blended heritage cues with modern conveniences.
- Analog vs. Digital Dash: Early S550 models (2015–2017) came standard with an analog gauge cluster. From 2018 onward, a 12-inch fully digital instrument cluster was available, but the base trims typically kept analog dials.
- SYNC Infotainment: Early models featured SYNC or SYNC 3, depending on trim. Higher trims or later years enjoyed Apple CarPlay and Android Auto compatibility.
- Traditional Layout: The cockpit has a classic dual-cowl feel, with round air vents reminiscent of older Mustangs. Materials and build quality are significantly improved compared to previous generations.
S650 Mustang
The S650’s interior takes a leap forward with cutting-edge displays and a tech-centric layout.
- All-Digital Setup: A large, customizable digital instrument cluster blends seamlessly with the center touchscreen in a single sweeping panel.
- SYNC 4: Faster processing, over-the-air updates, and wireless smartphone integration.
- Driver Assistance: Standard adaptive cruise control, lane-keeping assist, and other modern safety/convenience features.
- Cabin Design: More angular and futuristic than the S550, with improved ambient lighting options and new interior trim materials.
Powertrains and Performance
S550 Mustang
- 3.7L V6 (2015–2017)
- Offered as the base engine during the early S550 years. Produced around 300 hp and served as an affordable entry point into Mustang ownership.
- Discontinued after 2017, replaced by the EcoBoost as the primary non-V8 option.
- 2.3L EcoBoost (2015–2023)
- Turbocharged four-cylinder that generally made around 310–330 hp, depending on year and tuning.
- Offers a good balance of performance and better fuel efficiency compared to the V8.
- 5.0L Coyote V8 (GT)
- Initially 435 hp, later boosted to 460 hp (from 2018 onward) thanks to dual-fuel injection and increased compression. Delivers the classic Mustang V8 sound and feel.
Transmissions
- 6-speed Manual: Improved shifter feel over older Mustangs.
- 6-speed Automatic (2015–2017), replaced by 10-speed Automatic (2018–2023): The 10-speed offers quicker shifts and better fuel economy.
S650 Mustang
- 2.3L EcoBoost (2024+)
- Significantly updated with more low-end torque, revised internals, and improved efficiency.
- 5.0L Coyote V8 (GT)
- Bumped to 480 hp thanks to refined cam timing, higher compression, and better airflow.
- Dark Horse Variant
- A special performance-oriented 5.0L with 500 hp, strengthened internals, and additional track-focused features.
Transmissions
- 6-speed Manual: Retains a traditional stick-shift option for enthusiasts.
- 10-speed Automatic: Features revised shift mapping and faster downshifts, making it well-suited for both street and track.
Driving Experience and Everyday Usability
S550 Mustang
- Refined Ride: The introduction of independent rear suspension (IRS) vastly improved handling and ride comfort versus older Mustangs with solid rear axles.
- Everyday Usability: The seats and driving position are comfortable for daily commutes, but remain sporty enough for weekend fun.
- V6 vs. EcoBoost vs. V8: Early V6 models offered a basic, budget-friendly Mustang experience. The EcoBoost version delivered decent performance and good mileage, while the V8 GT provided the classic, rumbling Mustang performance.
S650 Mustang
- Enhanced Chassis Tuning: The S650 further refines IRS and overall suspension geometry for tighter handling, especially at higher speeds.
- More Tech-Driven: Adjustable drive modes, improved steering feel, and advanced driver aids make the S650 more user-friendly despite its increased performance potential.
- Refined Power Delivery: The updated EcoBoost and V8 engines offer smoother torque curves and better responsiveness.
The Verdict
Choosing between the S550 and S650 often depends on what you value most:
- S550:
- Has a bit of classic Mustang character, especially in early models with the analog cluster and the optional 3.7L V6 for a lower entry cost.
- Offers a good balance of retro styling cues and modern features.
- A huge aftermarket community supports endless customization.
- S650:
- Steps boldly into the modern age with its all-digital dash, updated exterior, and advanced tech.
- Improved powertrains (including a more potent Coyote V8) and increased driver-assistance features.
- Perfect for those seeking the latest Mustang experience, blending tradition with cutting-edge refinements.
Both continue the Mustang tradition of delivering driving excitement for a wide range of budgets and preferences. Whether you prefer the analog feel and slightly retro-modern vibe of the S550, or the futuristic, tech-savvy ambiance of the S650, Ford ensures that the Mustang remains a staple of American performance for generations to come.
Conclusion
In the ongoing evolution of the Ford Mustang, the S550 and S650 demonstrate how Ford balances heritage with innovation. From the final run of the V6 in the early S550 years to the new digital world of the S650, there’s a Mustang for nearly every enthusiast’s taste. Whichever path you choose, you’ll enjoy a car that has been at the forefront of American muscle for nearly six decades—and doesn’t show any signs of slowing down.
