20g would make the car a beast. You don't have to get headers but if you want to run an EWG you would need them. I dont believe the STi needs an uppipe but I'm sure an aftermarket one would flow much better. Injectors are a must you could probably run 750cc or 800cc (leaving you some headroom) and most commonly a Walbro 255 Fuel pump. While you are at it I would toss in a FMIC or at least a HUGE TMIC. I assume you have a TBE and EM...
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