Undefined Mercedes-AMG CLA 45 S 2019: 415-HP Performance Review

The 2019 Mercedes-AMG CLA 45 S stands out as a benchmark in compact performance cars, boasting the world’s most powerful production four-cylinder engine with 415 horsepower. This four-door coupe combines blistering acceleration, advanced all-wheel-drive technology, and a more refined daily driving experience compared to its predecessors, making it a compelling choice for enthusiasts seeking luxury and speed.

Design and Exterior Highlights

The CLA 45 S features a sleek, elongated silhouette that differentiates it from the mechanically similar A 45 S hatchback. Its gently sloping roofline and extended rear end create a more elegant profile, sitting 5mm lower for enhanced stability. Wider front track and larger tires contribute to its aggressive stance, while aerodynamic elements like unique spoilers and vents optimize airflow for high-speed performance.

• Aggressive front fascia: Prominent Panamericana grille and LED headlights with signature daytime running lights.
• Side profile: Sculpted lines, 19-inch AMG alloy wheels, and flared wheel arches emphasizing its sporty intent.
• Rear design: Quad exhaust tips, diffuser, and subtle spoiler for a planted look.

This design not only turns heads but also improves downforce and cooling efficiency, essential for track-capable dynamics.

Powertrain and Performance Specs

At the heart lies a hand-built 2.0-liter turbocharged four-cylinder engine producing 415 bhp and 369 lb-ft of torque in the S variant, paired with an eight-speed dual-clutch transmission. All-wheel drive is standard via the sophisticated 4MATIC+ system, which uses twin clutches on the rear axle for fully variable torque distribution to each wheel—up to 100% to the rear in drift mode.

Despite a 50kg weight increase over the A 45 S due to extra bodywork, acceleration remains explosive, hitting 62 mph in exactly four seconds. The system prioritizes front-wheel drive for efficiency, seamlessly engaging rear power for traction.

Chassis Dynamics and Handling

Mercedes-AMG engineers refined the suspension with frequency-selective shock absorbers and adaptive damping offering Comfort, Sport, and Sport+ modes. This setup reduces body roll, enhances high-speed stability, and provides better compliance over rough surfaces than earlier models.

On twisty roads, the CLA 45 S shines with immense grip from Michelin Pilot Sport tires. Initial understeer is quickly corrected by rear torque vectoring, allowing precise cornering. The steering, while light, delivers predictable feedback, and the drift mode unlocks playful rear-end rotation for skilled drivers.

• Braking: Six-piston front calipers with large rotors provide confident stopping power.
• Track capability: Stiffened chassis and re-engineered steering rack for sharper responses.
• Ride balance: Firmer than a standard CLA but more forgiving than rivals like the Audi RS 3.

Testing shows it handles imperfections better, with reduced noise and a smoother eight-speed gearbox.

Interior Comfort and Technology

The cabin blends sporty flair with Mercedes luxury, featuring AMG sport seats in leather with suede inserts, a flat-bottom steering wheel, and ambient lighting. Dual 10.25-inch displays run the MBUX infotainment system with voice control, Apple CarPlay, and Android Auto.

Rear space is tighter due to the coupe shape—headroom suffers for taller passengers—but the front offers excellent support and heated seats. Boot capacity is 460 liters, practical for a performance car, though the narrow opening limits bulky items.

Build quality impresses with premium materials, though some plastics feel entry-level for AMG standards.

Fuel Economy and Running Costs

Expect 23-30 mpg combined, respectable for its power. Maintenance follows Mercedes schedules, with AMG-specific parts adding to costs. UK pricing started around £55,000, positioning it as a premium buy.

Rivals Comparison

The CLA 45 S edges the Audi RS 3 in agility and power delivery, though the Audi offers sharper steering. Versus BMW M135i, it provides superior AWD sophistication. The A 45 S hatchback is nearly identical mechanically, differing mainly in style and boot access.

Pros and Cons

• Pros: Unmatched four-cylinder power, versatile handling, stylish design, improved refinement.
• Cons: High price, limited rear space, firm ride on poor roads.

FAQs

What makes the CLA 45 S engine special?

It delivers 415 hp from a 2.0L turbo four-cylinder, the most powerful production unit ever, with hand-assembly by AMG.

Is the CLA 45 S better than the A 45 S?

Mechanically similar, but the CLA offers a coupe aesthetic and slightly larger boot; choose based on style preference.

How does the 4MATIC+ system work?

Twin rear clutches enable variable torque to each wheel, including full rear bias for drift mode.

What’s the fuel economy?

Around 23 city/30 highway mpg, balancing performance and efficiency.

Is it practical for daily use?

Yes, with refined ride, good boot space, and tech, though rear seats suit shorter trips.