Nismo was then given the approval from Nissan to build Z-tune models for the Nismo anniversary. Nismo then purchased 18[72] used R34 GT-R V·Spec, each with less than 29,000 km (18,000 miles) on the odometer, they were then completely stripped and were resprayed to a "Z-tune Silver," a special colour exclusively for the Z-tune.[77] One car was left in its original colour of Midnight Purple III.[72] For each of the 18 production models,[72] the 2.8 L engine was revised to allow it to reach a speed of 8,000 rpm. The turbochargers were supplied by IHI in Japan. The engine is advertised to be able to generate 368 kW (500 PS; 493 hp) (for warranty reasons).[clarification needed] This second revision of the Z-tune engine is called the 'Z2'. The bodywork is designed with the same functional components used in Nismo's GT500 racing cars, such as engine bay vents on the bonnet and bumpers, as well as wider arches for wider wheels. The Z-tune is also improved with an aggressive suspension setup from Sachs, and a specially designed Brembo brake system.