First up is the street-legal GT570 package from HKS, one of Japan’s longer-established tuner firms with a history of GT-R tweakery running back to the 1989 R32 model.
The GT570 Sport Package is a development of an existing GT570 Racing Package designed originally for the track, which includes a new exhaust system, reprogrammed ECU, upgraded plumbing for the turbo and intercooler, a sequential blow-off valve kit, reinforced actuators and new spark plugs. Designed to boost output to 570PS at around 6,600rpm, the Racing Package is not road legal as it fails to meet emissions standards. Hence the arrival of the GT570 Sport Package, which adds a new high-flow stainless steel catalytic converter and upgraded wastegate actuators to bring tailpipe emissions within accepted limits. Parts will be available from HKS stockists later this year for both 2009 and 2010 model GT-Rs..
The company claims up to 600hp from the conversion, which basically adds a pair of Rotrex C30-94 superchargers to the existing twin IHI turbocharger installation, as well as high-flow fuel injectors and a massaged ECU.
The two engine-driven compressors are designed to pack greater low-end grunt into the GT-R’s delivery before the turbos get up to speed, apparently for ‘maximum attack’ circuit time trials. Good work!