HKS is planning on releasing at the end of July 2010, a full turbine kit as the GT800, featuring cast exhaust manifolds, Special GT II turbochargers , and GT II wastegates.
The turbos feature a symmetrical layout that uses normal and reverse flow turbines that HKS likens to twin turbo Formula 1 V6 technology. Cast exhaust manifolds are more durable than tubular style exhaust manifolds, and are getting more popular, as they bring OEM quality to the aftermarket.
In addition to the GT800 turbines HKS recommends , Forged piston and connecting rod set, R35 metal headgasket, R35 DCT fluid , R35 DCT reinforced oil pan , large size injectors, and R35 control system (release date August), the GT600 racing package, intercooler kit, and DCT fluid cooler kit. With all the supporting modifications they claim that 800 hp performance can be achieved.
Source : NAGTROC