On a side note, the original, very first twin scroll I built a couple of months back was on the dyno the other day:
This is a stock block VQ35DE, 9psi, stock intake manifold, no spacer single 3" exhaust, borla headers, Haltech ID1000 injectors.
For those that wish to get DJ comparable numbers, add 10%. Torque was kept a bit lower due to the weak stock rods.