Nissan Motorsports International (NISMO) has made the release of the GT3-spec GT-R official, pricing it at around $388,000 based on today’s conversion rates.

A joint project between NISMO and JR Motorsports (JRM), the Nissan GT-R NISMO GT3 packs a 3.8L V6, twin-turbo powerplant that is seen in the factory production model, but pumps out 523-hp. It may sound odd that it has slightly less horsepower than the factory 2013 GT-R with 545-hp, but it’s probably been tuned to GT3 regulations.

What you do get, however, is a GT-R packed with fully adjustable suspension, a gutted-out interior with a full roll cage, extra cooling ducts and an aggressive aero package. Power on the GT3 GT-R will be delivered through a six-speed, semi-automatic paddle-shift system. Those ordering the race-ready GT-R will receive support from NISMO if you’re in Japan, Asia, North or South America and Oceania, while JRM will support Europe, Russia and the Middle East.

Nissan’s NISMO motorsports department has finally announced full details on the 2010 FIA GT1-spec GT-R race car and along with some expected changes, there’s also a big surprise. Under the hood you won’t find Nissan’s twin-turbo V6, but rather a naturally aspirated 5.6-liter V8 engine that produces 600-hp and 480 ft-lbs of torque. That’s sure to motivate the GT-R rather briskly, thanks to a curb weight that has been reduced to just 2,756 lbs.

Along with the significant weight reduction, thanks in part to a striped out-interior and the use of a carbon fiber aerodynamics, the FIA GT1-spec GT-R also gets 18-inch RAYS wheels and carbon ceramic brakes with six-piston calipers.

Two GT-R’s will run in the 2010 FIA GT1 World Championship, fielded by Britain’s Sumo Power GT and Swiss Racing Team and supported by NISMO. They will compete against Corvettes, Aston Martin DBR9s, Ford GTs, Lamborghini Murciélagos and more, with the first race of the season taking place in the United Arab Emirates on April 17th

GALLERY: FIA GT1 Nissan GT-R Race Car

Despite all of Nissan’s troubles, the company isn’t shying away from motorsports for 2009, with four factory backed cars running in Japan, as well as several privateer teams running in Japan, China, South Africa and even in Europe.

“Motorsports is an important part of Nissan’s strategy for building a strong brand with consumers who share our passion for high-performance driving,” said Carlos Tavares, Executive Vice President, Nissan Motor Co. Ltd. “In addition to being an important touch-point for consumers, motorsports serve as a dynamic proving ground for automotive innovation.”

That being said Nissan plans to back four teams in the SUPER GT series in the GT500 class. Team NISMO, Team Impul and Kondo Racing have all decided on running the Nissan GT-R, however, Hasemi Motorsport has not decided which platform it will use.

Some of the most exciting news, however, is that Gigawave MotorSport will run a NISMO-developed car in the FIA GT1 class in the U.K. The car will only run four races in 2009 and, therefore, won’t compete for the championship. The driver’s names are not official but are expected to be Michael Krumm ( a NISMO driver) and Darren Turner of Gigawave, a team that has compete in the FIA GT series since 2007.

Now if only a NISMO GT-R could make its way to the American Le Mans Series.

Official release after the jump:

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