Nissan has officially unveiled the updated version of its giant-killing GT-R in Japan today.

The car's styling modifications may be limited, but underneath the manufacturer insists it has carefully rethought or retuned the GT-R to offer the 'world's best multi-performance and responsive driving pleasure.'

That should not be dismissed as an idle statement. The current GT-R is already one of the finest performance cars ever conceived, and its successor apparently boasts more power, improved handling, better aerodynamics and greater fuel efficiency.

Nissan has extracted more grunt from the car's spectacular 3.8-litre V6 by tweaking the turbocharger's boost pressure and modifying the valve timing. The tinkering means the engine's output rises from 478bhp to 523bhp, and torque is up to 451lb ft from 433lb ft.

Doubtless this means the GT-R's already stellar performance statistics will have marginally improved, but the retune also slightly enhances fuel economy by 2mpg to around 24mpg.

To better harness the car's dizzying pace, Nissan has installed a carbon composite strut brace across the engine compartment to augment rigidity and modified the suspension to increase grip and improve ride quality. Bigger brakes, lightweight forged aluminium alloys and better tyres are also in the offing.

The GT-R's exterior alterations may be slight, but most have been made to reduce drag or increase usable downforce. The new front bumper gets double rectifier fins and LED lights as well as a bigger grille, while the rear gets an extended diffuser to reduce air resistance.

Inside the car features a reshaped instrumentation panel and a new seat design, but otherwise it's much the same as the current model.

Those who want something different will have to hope Nissan decides to import some examples of the two new special editions. The Club Track edition gets a smattering of race parts and is aimed at those intent on taking their GT-R racing, while the Egoist model, with its bewildering array of customisable options, is intended for those who like attention at lower speeds.

While these variants may remain exclusive to Japan, the SpecV is almost certain to make it to these shores, and gets an overboost function which ups its torque output to 466lb ft.

That will likely be the pricey range topper in the UK, but even the entry level 'Pure' edition is likely to prove considerably more expensive than the current GT-R's £59,945 asking price. Reports suggest buyers will be looking at between £67k and £70k when the new car goes on sale next year.