There was a time when a hot hatchback was defined by its glorious simplicity. A naturally aspirated engine, a crisp manual gearbox, front-wheel drive, and a featherweight chassis. But we live in a different era now. We live in a world where a five-door family hatchback can develop 415bhp, dispatch 0-62mph in a supercar-baiting 3.9 seconds, and wear a price tag that makes your eyes water.

According to recent reports from Autocar, the Mercedes-AMG A45 S is preparing to bow out with a premium £68,000 ‘Final Edition’. For those of us who live for that perfect apex, this is a bittersweet moment. It represents the absolute zenith of combustion-powered hatchback engineering, but it also signals the end of an era of uncompromised, internal-combustion ballistic performance.

The Engineering Behind the Madness

Let’s look at the cold, hard numbers. Under the bonnet sits the M139 engine—a masterpiece of modern packaging and thermodynamic efficiency. Delivering 208bhp per litre, this turbocharged 2.0-litre four-cylinder is the most powerful series-production four-pot in the world. AMG engineers rotated the engine 180 degrees compared to standard transverse layouts, positioning the turbocharger and exhaust manifold at the rear. This allows for an incredibly flat, aerodynamically efficient nose and a much shorter, more direct intake path. The payoff? An incredibly punchy and responsive throttle that mimics a naturally aspirated engine as it charges toward its 7,200rpm redline.

On the road, the A45 S is nothing short of a weapon. Where older high-performance hatches would understeer or struggle for traction in the damp, the AMG’s trick 4Matic+ four-wheel-drive system uses two electro-mechanically controlled multi-plate clutches on the rear axle. It doesn’t just send power front-to-rear; it actively vectors torque between the left and right rear wheels. Pitch it into a tight bend, crack the throttle open, and instead of washing wide, the rear outer wheel digs in, rotates the car, and hurls you down the next straight. It feels intensely planted, razor-sharp, and devastatingly fast.

“The way the AMG A45 S vectors torque across the rear axle doesn’t just defy physics; it rewriting the rulebook on how a hot hatch should handle.”

The Digital Illusion vs. Analog Joy

Yet, for all its digital wizardry, the A45 S begs a crucial question about raw driver engagement. Does a £68,000 computer-controlled rocket ship offer the same pure grin-factor as something more rudimentary? When you look at the grassroots racing reported by Autosport—such as the intense slipping and sliding of the United Formula Ford grid at Snetterton, or the roaring Mini 7s at Thruxton—you realise that driving joy isn’t directly proportional to horsepower or price. In those paddock-level series, drivers manage weight transfer on skinny tyres with pure physical feedback.

It’s a contrast that becomes highly visible when looking back at the ancestors of the hyper-hatch. Autocar’s list of the best modern Audis reminds us of the legendary Audi RS2 Avant—the car that practically invented the concept of supercar-slaying family transport. That car relied on a characterful five-cylinder turbocharged engine, a mechanical Torsen differential, and a manual gearbox. It was heavy and laggy by modern standards, but the physical connection required to extract its performance made every drive an event. In comparison, the AMG A45 S does the heavy lifting for you, turning any driver into a hero with its infinite grip and ballistic acceleration.

The Cost of Extreme Performance

And then there is the elephant in the corner: the £68,000 asking price. While the slightly less powerful AMG A35 will remain on sale to prop up the entry point of the range, losing the full-fat A45 S means losing a benchmark. For this money, you are firmly in Porsche Cayman territory—a mid-engined sports car that, while less practical, offers a level of steering purity and chassis balance that no all-wheel-drive hatchback can ever truly replicate.

Key Takeaways: Mercedes-AMG A45 S Final Edition

  • The Powerhouse: 2.0-litre M139 engine producing 415bhp and 369lb ft of torque.
  • The Performance: 0-62mph in 3.9 seconds with a top speed of 174mph.
  • Intelligent Grip: AMG Torque Control uses twin rear clutches to actively vector torque and eliminate understeer.
  • The Premium: A final price tag of £68,000 places it in direct competition with dedicated sports cars.

The Verdict

The Mercedes-AMG A45 S is a towering achievement of modern engineering. It is a car that can commute in comfort on Monday, haul a flat-pack wardrobe on Thursday, and embarrass dedicated supercars on a track day on Saturday. But as it prepares to bow out, it leaves behind a legacy that may never be matched. It is the absolute peak of the hyper-hatch phenomenon—highly engaging, devastatingly quick, and undeniably special. If you have the means, grab this piece of automotive history before the quiet hum of electrification takes over for good.