We have a HKS GT-SS Turbo Kit for the Nissan Skyline GT-R (BNR32, BCNR33 and BNR34). This set has just been used for 10,000km before it was removed out from a GT-R.
Here is what HKS have to say about the HKS GT-SS Turbo Kit:-
HKS GT Ball-Bearing Sport Turbo Upgrades are bolt-on turbo upgrade kits for factory turbo-charged vehicles. These kits consist of new, larger HKS GT turbos designed to bolt directly on to the stock manifold(s). HKS GT Sport Turbos are designed and sized to promote maximum power and response for maximum airflow throughout the RPM band. From the HKS precision cast turbine and compressor housings to the specially designed blades, each turbo is crafted to provide high levels of performance and quality.
Designed exclusively for the GT-R turbine. Turbine size is within the allowed horsepower of 600ps for a normal engine and it provides enough capacity for maximum performance.
Top output in the high-rpm range is made possible without sacrificing response in the low-rpm range by using a ball bearing turbo as opposed to the metal turbine for the factory-designated unit.
The clearance and shape of the compressor wheel, compressor housing and turbo housing are redesigned to optimum specs. Output in low and medium to high-rpm ranges are now enhanced.
In each kit reinforced adjustable actuators are attached. The spring constant is increased by 50% over the N1 spec. It prevents any pressure drop in the high-boost region. This gives you precise control in the 0.8~1.6km/sq.cm boost range.
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