The Ford Shelby II GT 500KR 5.4 V8 (548 Hp) represents a pinnacle of American muscle car engineering, a limited-production, high-performance variant of the fifth-generation Ford Mustang. Launched in 2008 and produced through 2009, this special edition paid homage to the legendary 1968 Shelby GT500KR, or “King of the Road.” Developed collaboratively by Ford’s Special Vehicle Team (SVT) and Shelby Automobiles, Inc., the GT500KR was designed to elevate the already potent Shelby GT500 into an even more exclusive and track-focused machine, cementing its status as a highly sought-after collector’s item and a formidable performer on both the street and circuit. This coupe embodies the raw power and distinctive styling that define the Shelby legacy within the Ford performance lineage.
The Ford Shelby II GT 500KR 5.4 V8 (548 Hp): A Modern King of the Road
The Shelby GT500KR emerged as a celebration of the Mustang’s 40th anniversary and the 40th anniversary of the original “King of the Road.” Its brief production run underscored its exclusivity, with only 1,000 units initially planned for 2008, followed by another 712 in 2009, making it a rare sight. Positioned at the very top of the Mustang hierarchy, the GT500KR was more than just a trim level; it was a comprehensive performance package featuring significant upgrades to the powertrain, chassis, and aerodynamics. It seamlessly blended modern automotive technology with the iconic heritage of Carroll Shelby’s performance philosophy, catering to enthusiasts who demanded uncompromising power and a distinct connection to Mustang’s storied past.
Engine and Performance
At the heart of the Ford Shelby II GT 500KR 5.4 V8 (548 Hp) lies a formidable 5.4-liter (5408 cm3 or 330.02 cu. in.) V8 engine, a supercharged and intercooled powerhouse meticulously engineered for extreme performance. This front-longitudinal engine features a DOHC (Dual Overhead Camshaft) valvetrain with four valves per cylinder, optimizing airflow and combustion efficiency. With a compression ratio of 8.4:1, the engine is fed by a multi-port manifold injection system and boosted by a supercharger, which is critical to its impressive output. The result is a peak power of 548 horsepower delivered at 6250 rpm, establishing a robust power-to-liter ratio of 101.3 Hp/l.
Torque delivery is equally impressive, with a massive 692 Nm (510.39 lb.-ft.) available at 4500 rpm, providing relentless acceleration across a broad rev range. This immense torque is crucial for the car’s muscle car character, allowing for exhilarating launches and strong mid-range pull. Power is channeled to the rear wheels via a robust 6-speed manual transmission, offering drivers an engaging and direct connection to the car’s formidable capabilities. The powertrain architecture emphasizes a traditional, driver-focused experience, honoring the roots of American performance vehicles.
The vehicle’s performance metrics further highlight its potency. With a curb weight of 3904.39 pounds (1771 kg), the GT500KR boasts an excellent weight-to-power ratio of 3.2 kg/Hp (309.4 Hp/tonne). The weight-to-torque ratio stands at 2.6 kg/Nm (390.7 Nm/tonne), indicating that the engine’s power and torque are effectively utilized to propel the vehicle with tremendous force. These figures underscore the GT500KR’s ability to deliver breathtaking straight-line speed and impressive dynamic performance, distinguishing it from its contemporaries and solidifying its reputation as a true “King of the Road.”
Design and Features
The design of the Ford Shelby II GT 500KR 5.4 V8 (548 Hp) is an unmistakable blend of classic Mustang aesthetics and aggressive, performance-oriented modifications. As a two-door coupe with four seats, it maintains the iconic pony car silhouette while integrating specific enhancements that signify its “King of the Road” status. The overall length measures 187.99 inches (4775 mm), a width of 73.9 inches (1877 mm), and a height of 53.74 inches (1365 mm), contributing to its assertive stance. The wheelbase extends 107.09 inches (2720 mm), providing a stable platform for high-speed maneuvers.
Visually, the GT500KR distinguishes itself with a unique carbon fiber hood featuring a prominent scoop and functional vents, aiding in engine cooling and reducing front-end lift. Distinctive racing stripes, special badging, and a revised front fascia with larger air intakes further enhance its aggressive appearance. The drag coefficient is a respectable 0.35, reflecting a balance between aerodynamic efficiency and muscular styling. The interior features Shelby-branded elements, including embroidered seats, a serialized dash plaque, and unique instrumentation, reinforcing its exclusivity and performance pedigree. The cabin, while performance-focused, retains the essential comforts expected of a modern grand tourer, making it suitable for both spirited driving and longer journeys.
Underneath its striking exterior, the GT500KR is equipped with a robust chassis and advanced braking system. It features ventilated disc brakes at the front and disc brakes at the rear, complemented by an Anti-lock Braking System (ABS) to ensure potent stopping power and enhanced control. Steering is handled by a precise rack and pinion system, offering direct feedback to the driver. The vehicle rides on staggered 18-inch wheels, fitted with high-performance tires—255/45 ZR18 at the front and wider 285/40 ZR18 at the rear—optimizing grip and handling dynamics. These features collectively contribute to the GT500KR’s exceptional road-holding capabilities and its ability to confidently tackle demanding driving conditions.
Technical Specifications
| Category | Specification |
|---|---|
| Brand | Ford |
| Model | Shelby |
| Generation | Shelby II |
| Type (Engine) | GT 500KR 5.4 V8 (548 Hp) |
| Start of Production | 2008 year |
| End of Production | 2009 year |
| Powertrain Architecture | Internal Combustion engine |
| Body Type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-Power Ratio | 3.2 kg/Hp, 309.4 Hp/tonne |
| Weight-to-Torque Ratio | 2.6 kg/Nm, 390.7 Nm/tonne |
| Power | 548 Hp @ 6250 rpm. |
| Power per Liter | 101.3 Hp/l |
| Torque | 692 Nm @ 4500 rpm. (510.39 lb.-ft. @ 4500 rpm.) |
| Engine Layout | Front, Longitudinal |
| Engine Displacement | 5408 cm3 (330.02 cu. in.) |
| Number of Cylinders | 8 |
| Engine Configuration | V-engine |
| Cylinder Bore | 90.2 mm (3.55 in.) |
| Piston Stroke | 105.8 mm (4.17 in.) |
| Compression Ratio | 8.4:1 |
| Number of Valves per Cylinder | 4 |
| Fuel Injection System | Multi-port manifold injection |
| Engine Aspiration | Supercharger, Intercooler |
| Valvetrain | DOHC |
| Engine Oil Capacity | 6.1 l (6.45 US qt) |
| Coolant Capacity | 20 l (21.13 US qt) |
| Kerb Weight | 1771 kg (3904.39 lbs.) |
| Fuel Tank Capacity | 60 l (15.85 US gal) |
| Length | 4775 mm (187.99 in.) |
| Width | 1877 mm (73.9 in.) |
| Height | 1365 mm (53.74 in.) |
| Wheelbase | 2720 mm (107.09 in.) |
| Front Track | 1572 mm (61.89 in.) |
| Rear (Back) Track | 1587 mm (62.48 in.) |
| Drag Coefficient (Cd) | 0.35 |
| Drivetrain Architecture | Internal combustion engine (ICE) drives the rear wheels. |
| Drive Wheel | Rear wheel drive |
| Number of Gears and Type of Gearbox | 6 gears, manual transmission |
| Front Brakes | Ventilated discs |
| Rear Brakes | Disc |
| Assisting Systems | ABS (Anti-lock braking system) |
| Steering Type | Steering rack and pinion |
| Tires Size | 255/45 ZR18; 285/40 ZR18 |
| Wheel Rims Size | 18 |
Legacy and Market Impact
The Ford Shelby II GT 500KR 5.4 V8 (548 Hp) holds a significant place in the pantheon of American muscle cars, not just as a high-performance vehicle but as a modern interpretation of a legendary nameplate. Its limited production run from 2008 to 2009 ensured its immediate status as a collector’s item. The “King of the Road” moniker, revived from the iconic 1968 model, imbued the car with a deep sense of heritage and exclusivity that resonated strongly with enthusiasts and collectors alike. This strategic homage underscored Ford and Shelby’s commitment to preserving the brand’s legacy while pushing the boundaries of contemporary performance.
In its market segment, the GT500KR faced competition from other high-performance American vehicles, such as the Chevrolet Corvette Z06 and the then-new Dodge Challenger SRT8, both offering their unique blends of power and styling. However, the Shelby GT500KR distinguished itself through its direct link to Carroll Shelby’s personal involvement and its position as the ultimate expression of the retro-styled S197 Mustang platform. Its bespoke components, including the carbon fiber hood, unique suspension tuning, and supercharged engine, justified its premium pricing and solidified its position as a top-tier performance car.
The GT500KR’s impact extended beyond sales figures; it reinforced Ford’s commitment to performance and the enduring appeal of the Mustang brand. It demonstrated that a modern muscle car could successfully blend classic design cues with cutting-edge engineering. Its mechanical integrity, combined with its striking aesthetics, contributed to a reputation for being a formidable track machine that could also be driven on the street. Today, the Ford Shelby II GT 500KR 5.4 V8 (548 Hp) remains a highly desirable model, frequently appearing at auctions and in private collections, continuing to command strong values due to its rarity, performance credentials, and the indelible legacy of the Shelby name. It stands as a testament to American automotive prowess and a cherished piece of Mustang history, bridging the gap between its classic predecessors and the next generation of high-performance vehicles.
