The centerpiece of the A45 S is the hand-built , currently the world’s most powerful four-cylinder in series production. Power Output : 421 hp and 500 Nm of torque. Specific Output : An incredible 211 hp per liter.

: To handle the immense heat, the turbocharger is water, oil, and air-cooled, with a mechanical pump capable of moving 280 liters of water per minute. Performance Benchmarks

Mercedes-Benz AMG A45 Review 2026 | Price, Interior & Engine

The A45 S is designed for explosive acceleration and technical track precision: : Achieved in just 3.9 seconds . Top Speed : Electronically limited to 270 km/h (168 mph) .