Under a grey tarp in the corner of the Sumo Power/JR Motorsport factory was a little piece of Nissan history, a dusty but beautiful early '80s 2-door coupé DR30 Skyline. Parked up next to the two brand new race-prepped GT-Rs, it was in stark contrast to the high-tech engineering of the 2010 GT1s. Sumo Power boss Andy Barnes filled in the