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We've been working with COBB for a few days now on a new custom map. We were able to make some good powers with the GT570 kit and the factory twin turbos on 109OCT at 1.3 BAR which is only 18.2-19 PSI.
We feel the factory turbos have more potential and will keep you all updated shortly once we have tuned our own R35 GTR with HKS FCON VPRO.
^^^ ditto very curious cause ALL cars cross torque and hp at 5250. and the weird and large hp dip at the higher rpm range? are the turbo's out of their efficiency range?