Volkswagen used the Beijing Auto Show to unveil an astonishingly powerful Golf concept, the VW Golf R 400.

Based on the Golf R, itself already boasting 300PS from its 2.0-litre turbocharged four-cylinder engine, the Golf R 400 boosts this to an incredible 400PS.

Torque has increased too, from 380Nm to 450Nm, available all the way from 2,400 to 6,000rpm.

This extra grunt propels the six-speed DSG-equipped Golf R 400 from 0-62mph in just 3.9 seconds, a whole second faster than the regular Golf R, and on to an electronically-limited 174 mph top speed.

Achieving this level of performance has required the use of a turbocharger with a higher charge pressure and a reinforced crankcase.

However, VW say the Golf R 400 weighs the same 1,420kg as the 300PS version.

Externally, the R 400 is 20 mm wider on each side thanks to flared wheel-arches, with new sill extensions, 19-inch alloy wheels, and Silver Flake metallic paintwork that contrasts with the black roof and carbon door mirrors.

The front bumper has been re-profiled to provide extra cooling, while a carbon-fibre splitter and aerodynamic elements help direct air flow.

The changes at the front are rounded out by a lemon yellow stripe across the grille and matching yellow badging.

The rear bumper incorporates additional vents, while the Golf R’s quad-tailpipes have been replaced by a centrally-mounted pair.  A black double spoiler with integrated LED brake lights is fitted to the roof.

Motorsport-inspired seats in Alcantara and ‘carbon leather’ join the prodigious use of carbon-fibre trim in the cabin.

Don’t get your hopes up, though; VW is at pains to point out there are currently no plans to put the Golf R 400 into production.