The latest Mercedes-AMG C63 has one of the most impressive engines in the world. It makes 234.5 horsepower per liter, a figure unmatched by any mass-production car on the market. It's half the size of the engine it replaced but had the same output.

Claimed to have been born out of two years of development, Vuk has fitted the twin-turbo 4.0-litre V8 engine from the previous-generation W205 C63 into the new W206 C63 S E Performance, replacing its turbocharged 2.0-litre four-cylinder plug-in hybrid powertrain.

Vuk Manufaktur has spent two years making the C63 S that Mercedes-AMG should have built. The standard plug-in hybrid powertrain may have more power, but it cannot match the V8’s sound. There’s no word on whether the Austrian company plans to sell V8 conversions to customers.