Some information on the R35 GT-R ST1 specifications for 2011/2012 have been released by GT-R World, and GT-R Blog. The ST1(Super Tec) car from Nissan/Nismo costs approximately 23,000,000 yen.
Super Taikyu is an endurance race series from Japan. Super Taikyu race cars are production based cars with modifications to bring them up to race levels. The tires used are full slick tires mounted on 20" Volk Racing G2 wheels.
In its first race, the ST1 Nissan GT-R started in 3rd, and finished in 8th place in a rain soaked debut at Fuji Speedway July 26-27, 2010. The next Super Taikyu race on the schedule is September 4th-5th.
Source: Super Taikyu Website , GT-R World , GT-R Blog , You Tube