I'm surprised no one had posted this video yet.
I've always had a concern for the GR6 transmission though. The engine is a friggen marvel, but I've seen countless transmissions screwing up on the track on tuned GT-R's.
I talked to an owner who was running 540 at the wheels and said that anytime you go above 600 hp, you absolutely need to upgrade the GR6 unit or else it'll keep failing. Don't know what upgrades are available for it though.