Mercedes-Benz A-Class AMG prototype caught testing

The Mercedes-Benz A25 AMG has disrobed almost completely compared to the last time we saw it. It makes minimal changes to the A-Class form, just a fiercer set of wheels and, under the last remaining camo, a brace of larger air intakes in front and a restyled diffuser in back. We'd also expect those oval pipe finishers to be swapped for trademark AMG quad pipes come production time.

The engine is what will make the real difference, with its 2.0-liter four-cylinder rumored to be rated as high as 350 horsepower and sending that glory to all four wheels through a dual-clutch gearbox. Those specs mean the A25 AMG is a shoo-in for heaps of comparos with the all-wheel drive, 340-horsepower Audi RS3, the driving prowess of the 256-horsepower Volkswagen Golf R and the rumored 320-horsepower BMW 135i hatch. Check it out in our gallery of high-res spy photos.