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classic sti bottom end will be forging it next year fmic adjustable fuel reg 900cc lateral flowed injectors full 3 inch open neck dcat will have avcr heads on very soon simtek ecu blitz air filter . was thinking of sc46 ???
Works well, mapped a couple recently with both of them running our 2.1 stroker motors.
First example on Vpower using an uprated silicone turbo inlet hose.
Second example on a stock plastic intake hose and 20% meth.
I would probably go for a MD321T billet or a SC46 billet. probably bit of an overkill for your 400 bhp target, but you can set it at low boost now and have 400, and then once you have forged your engine, crank up the boost to the 450 mark or more. Saves you messing with turbos when you drop the new engine in later. good move with the avcs heads as it would be quite laggy without them.
i'd probably do something about a 6 speed too, as the gearboxes aren't gonna last long with turbos like the sc42 etc unless you change gear like a granny.