i have an st turbo and im going to change to large turbo, hopefully soon, i kno i have to chane the ecu system to an omex 600 or autotronic or something, but before i have it fitted and mapped i have to fit everythiing else. but i dont kno what too get and i wanna run around 400bhp,

current spec (engine rebuilt 4k ago harvey gibbs)

-low comps machined valve cut outs
-mild port and polish head
-rs 500 intercooler
-ggr 305 bhp kit.

im going to get a tubular manifold, but i dont kno what turbo, cams or injectors too get, any advice would be greatfull guys !!!