NISMO & THE Z-TUNE R34...Whaa?!

Nismo originally designed the concept of the Z-tune in 2002 when Nissan was putting an end to the R34 Skyline production. The first Z-tune was built in 2003, using a used 2002 Skyline GT-R V-Spec II.

It was built with a concept RB26DETT 'Z1' engine. This engine was based on Nissan's Le Mans GT2 and GT500 racing experiences. As with the racing vehicles a strengthened engine block and stroked crankshaft were utilized. The engine was also bored. With the new displacement of 2.8L and upgraded turbo-chargers the Z1 produced 500 hp. The Z-Tune had a 0–60 mph time in 3.2 seconds and has a top speed of over 195 mph.

Nismo was then given the approval from Nissan to build Z-tune models for the Nismo anniversary. Nismo then purchased 20 used R34 GT-R V-Specs, each with less than 18,000 miles on the clock, they were then completely stripped and were resprayed to a "Z-tune Silver," a special color exclusively for the Z-tune.

For each of the 20 production models, the 2.8L engine was revised to allow it to reach 8000 rpm. The turbochargers were supplied by IHI in Japan. The engine is advertised as making as much as 500 hp (for warranty reasons).

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 hood and fenders, as well as wider fenders for wider wheels. The Z-tune is also improved with an aggressive suspension setup from Sachs, and a specially designed Brembo e brake system.

The entire car is essentially handmade, with the car being completely stripped and re-built from the chassis up. Engineers reinforced and stiffened the chassis seam welding in key areas such as the door seams and door frames and added carbon fiber to the strut towers and transmission tunnel and the engine bay, completely redesigning the suspension, drivetrain, engine, gearbox and other components so as to work at maximum efficiency and reliability as is expected of a road-going vehicle.

Although Nismoplanned on building 20 cars, they ceased production on only 19 (including 2 prototypes).  The Z-tune is often regarded as the most expensive  street legal GT-R ever built