Serious Nissan GT-R tuners aren't coming out of the woodwork – yet – but one of Japan's largest aftermarket firms has thrown its hat into the ring, and to good effect. HKS will begin offering its GT570 kit to consumers in Japan later this year (no word on U.S. distribution) and as it's name implies, output is getting close to the 600 hp mark. The package includes new wastegate actuators for the stock turbos and an electronic boost controller, along with aluminum intercooler piping, silicon hose couplers and straight pipes that replace the stock catalytic converters, reducing back pressure, but negating the GT-R's road-legal status.

All of those tweaks add up to a total of – you guessed it – 570 PS, or 562 hp and 540 lb.-ft. of torque at the wheels. Check the gallery below to see the dyno charts and a few shots of the wastegate and plumbing mods.

NISMO has finally released all the details on its line of upgrades for the R35 Nissan GT-R, and per usual, there's good news and bad news.

On the positive side, the parts are the typical blend of OEM quality and fitment, with a focus on tighter handling and weight reduction. The Club Sport tuning package includes the Chassis pack made up of race-tuned Bilstein Damptronic adjustable dampers sheathed in 18.5kg/mm (front) and 9.6 kg/mm (rear) springs. The combination of rock-hard coils and adjustable damping at both low and high speeds should make the GT-R stickier in the corners and more stable while bombing through a fast sweeper. Rounding out the handling package is a set of Rays forged aluminum wheels, sized 20x9.5-inches in front (+45mm offset) and 20x10.5-inches (+25mm offset) in the rear, and wrapped in Bridgestone RE070R run-flats, sized 225/40 and 285/35, front and rear. These are rumored to be the same rollers we'll see on the Spec-V when it's unveiled in Paris this October.

The rest of the parts focus on weight reduction, beginning with a lightweight axle-back exhaust that drops 11 pounds from the GT-R's curb weight, along with a carbon fiber undertray that reduces air turbulence and parasitic drag. Upgraded carbon-fiber backed and leather-trimmed seats are also part of the package, which retains the side airbags but nixes the electronic controls, reducing weight by another 13 pounds total. Naturally, some NISMO badging rounds out the upgrades.

Now here's the bad news: the parts are only available in Japan as a package, can only be installed by 12 NISMO-authorized shops and come in at a whopping ¥5,460,000 (over $50,000). However, some U.S. importers have already worked out a distribution deal with NISMO, but for those of us in the States, we don't get the added benefit of the three-year/60,000 km warranty.