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So a -13 should do for my 500 - 550 HP goal! Think I will take a -14 though with 0.82 AR exhaust housing. That one has the GT35 compressor with 65 Lb/min flow capacity.
I will release a small part of my plans: In my silver MY99 turbo I want to fit a complete MY05 STi suspension (alloy wishbones front and rear and Spec-C geometry) including hubs, brakes, differentials, etc., JDM 6 speed gearbox with DCCD (with some sort of motorsport controller), stripped interior with lighter seats, alloy or carbon hood, 2.35 engine (US closed deck 2.2 block, 2.5 crank, CP pistons and Arrow rods), JUN cams, homemade inlet manifold, etc.
When I start the whole operation, I will post in the projects forum.