Despite fears Nissan’s new GT-R wouldn’t tolerate anyone tinkering around with its innards, Japan’s industrious tuning firms have managed to develop a number of aftermarket parts claimed to boost performance of the supercar. Initial testing showed that even simple mods such as adding new wheels or breathing mods could make the car’s ECU go haywire, but Japan’s Amuse has shown that it is possible to boost the car’s performance levels far beyond the claimed factory output of 473hp.

Amuse has a long history of tuning the GT-R, with previous generations based on the twin-turbocharged RB26DETT 2.6L engine developing in excess of 1,000hp.

Its latest creation is called the Power House Amuse Phantom GT-R, and is based on the more luxurious Black Edition model. Peak output stands at 602hp at 6,500rpm and 571lb-ft of torque at 5,300rpm, which is enough to see the car run Japan’s legendary Tsukuba test circuit in just 1m and 1.32 seconds.

Modifications start with the removal of the car’s speed limiter, followed by an ECU retune to accommodate much high boost pressures. The car’s standard exhaust system is also replaced with a lighter high-flow titanium unit, which is joined by an electronic boost controller.

To improve handling, Amuse adds stiffer springs and threaded sleeves that allow for height adjustment at front and rear. The final addition is a set of Recaro carbon-Kevlar racing seats, along with a removable Momo steering wheel, reports AutoWeek.

The combined weight savings from the new carbon seats plus the titanium exhaust is a substantial 100 pounds, bring the car’s final kerb weight to just over 3,690 pounds all up.

Amuse currently sells its aftermarket accessories in most major markets including the U.S., however the latest GT-R parts aren’t expected to arrive until early next year.