What differentiated this C63 from the “average” Vaeth V63RS was the engine. While the V63RS engine tops out at 572 hp, the engine in this particular C63 is good for 597 hp thanks to some good old-fashioned tuning we don’t see tuners doing much of anymore. The heads were ported and polished, bigger intake and exhaust valves were installed and are activated by bigger cams and stiffer springs. The pistons are lighter and forged. Vaeth said they’re designed to produce more torque but the difference in peak torque between the standard V63RS engine and this one is only 7 lb-ft (502 vs. 509). The ECU was reprogrammed to match the increased breathing, and exhaust flows through stainless-steel, high-flow cats and a titanium system. It takes six weeks to build this particular spec of engine, and Vaeth said only five of them exist worldwide. Vaeth’s oil cooler was installed and the car also uses Vaeth’s Fuel Cooler, which lowers the temperature of the gas to increase density and make each drop more powerful.

The next step was shaving weight. Vaeth’s carbon-fiber hood is part of the V63RS package, but the client went a step further and had the rear seats taken out. Other areas have also had weight taken out; Wolfgang Vaeth claimed the car is 220 pounds lighter than stock.

The car rides on a set of Vaeth’s adjustable coilovers, and I suspect they’re set towards the firmer side of the scale because the ride was stiff, even on Germany’s smooth pavement. That hard ride around town, however, was perfectly stable at autobahn speeds, yet another example of the car’s no-compromise, single-purpose theme.

The other parts of the suspension equation are forged, three-piece 19-inch wheels and Yokohama Advan Sport tires (235/35 front, 255/30 rear). Vaeth also makes a 20-inch three-piece as well for the C-Class. There’s a limited-slip differential and the brakes are six-piston calipers that squeeze 14.9-inch discs. In the limited time I had with the car, I only got to throw it into a few on-ramps. There was some body roll and you could sense the weight of the big V8 up front, but it clung tightly to the intended line.

The big V8 sits behind Vaeth’s badgeless front grille. Beneath the grille is the company’s front spoiler, which they refined in the wind tunnel to reduce lift and feed more air into engine bay to reduce temperatures by up to 6 degrees Celsius. The rear carbon lip spoiler is extended with a rubber lip on top of it and the rear diffuser is a prototype that features aluminum fins instead of the regular carbon-fiber ones.

Laying into the throttle brings out a blood-boiling, feral shriek from the titanium exhaust, like T. rex with strep throat. The seven-speed auto ’box disposes of gears with clinical efficiency and matches revs when it comes down through the gears. The car responds instantly to steering inputs and the brake pedal is firm and the bite is tenacious. It’s all very racey and very raw, but not so much that it can’t be driven daily or used for commuting. It’s like the boy racer that went to the best finishing school.

You could say Vaeth built the C-Class that Mercedes-AMG was afraid to: a Black Series C63. And they did it by thinking outside the ECU and going inside the engine to open up the airflow the old-fashioned way. Funny what you can achieve when you combine the best of both worlds.

Väth V63RS C63 AMG

Layout
Longitudinal front engine, rear-wheel drive

Engine
6.2-liter V8, dohc, 32-valve, ported and polished heads, larger cams and valves, high-flow cats, titanium exhaust

Transmission
Seven-speed automatic

Suspension
Vaeth coilovers

Brakes
Six-piston calipers, 14.9-inch rotors

Wheels and Tires
Vaeth 19-inch, 3-piece forged alloys,
Yokohama Advan Sport, 235/35 (f), 255/30 (r)

Exterior
Vaeth carbon front spoiler, carbon rear lip spoiler, aluminum rear diffuser

Performance
Peak Power: 597 hp
Peak Torque: 509 lb-ft

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