Mercedes-AMG CLE V8: Flat-Plane Brilliance Meets Aston Martin’s Superior Tuning

The Mercedes-AMG CLE V8 arrives as a masterclass in engineering compromise. Mercedes took the proven M177 twin-turbo V8 and fundamentally reimagined it—ditching the cross-plane crankshaft for a flat-plane layout that quickens throttle response and reduces rotational mass. The result is a 637-horsepower engine that feels alive in ways most luxury coupes never achieve. However, our analysis reveals a sobering truth: Aston Martin’s tuning of the same engine family proves what’s truly possible when you refuse to play it safe.

Flat-Plane Engineering Meets Road Reality

Mercedes’ decision to abandon the cross-plane configuration wasn’t cosmetic—it was visceral. Furthermore, the flat-plane design allows the engine to rev with unflinching urgency, delivering snappier throttle modulation than the standard M177 found in the GLE 63. The CLE V8 gains 34 horsepower over that baseline, reaching 637 HP at 5,500 RPM with 627 lb-ft of torque available between 2,000 and 4,500 RPM.

However, this is where the story gets interesting. Mercedes engineered a revised cooling system and fitted a titanium Akrapovic exhaust to manage the extra grunt. Therefore, the engine breathes easier while shedding weight—a combination that transforms the driving experience from merely quick to genuinely engaging. The mechanical symphony that emerges from that Akrapovic system is no afterthought; it’s a deliberate statement of performance intent.

Aston Martin’s Superior M178 Mastery

Yet here’s where Aston Martin’s engineering prowess becomes undeniable. The British marque secured the more hardcore M178 variant—the track-focused engine that Mercedes deemed too aggressive for the CLE V8. Consequently, Aston Martin partnered with Red Bull Racing and Adrian Newey to extract 817 horsepower from the same V8 family, with hybrid assistance pushing total output to a staggering 1,064 HP.

The differences are profound. In addition to larger turbos and a dry-sump lubrication system, Aston’s engineers developed bespoke pistons and a revised camshaft. Specifically, these upgrades allowed the Valhalla to harness the hybrid system’s additional grunt while maintaining mechanical reliability. The CLE V8 is brilliant engineering. Aston Martin simply proved that brilliance has untapped potential.

The Verdict: Competence Versus Mastery

Mercedes-Benz delivered a genuinely impressive engine in the CLE V8. The flat-plane crankshaft, Akrapovic exhaust, and revised cooling represent thoughtful engineering for road-focused performance. Nevertheless, Aston Martin’s tuning of the M178 demonstrates what happens when you refuse to compromise—when you push the M17 family to its absolute limits with F1-grade engineering support.

The Mercedes-AMG CLE V8 is a proper performance sedan. But Aston Martin proved the engine could sing louder. For more on high-performance engine engineering, check out Auto News Magazine. According to Mercedes-AMG, the CLE V8 represents the pinnacle of road-focused V8 engineering. Yet the numbers tell a different story—one where Aston Martin’s vision ultimately prevails.

Written By

Marcus Vance

Senior Track & Performance Editor at Auto News Magazine. Veteran automotive journalist specializing in chassis dynamics, apex telemetry, track-day specials, and high-revving mechanical purity.

View all articles by Marcus Vance →