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I have somewhat searched the boards, we just acquired a 91 leg turbo. The turbo is seized and we have a TD04, wrx intercooler and even STI injectors and rails. I am wondering what is needed(engine management wise) to install the components. if there is one thing that needs a computer where the rest does not.. please school me.

The only thing you would need EM for is if you installed the STi injectors, otherwise you'll be fine upgrading the other stuff.

sell me your injectors and rails, and check out one of the many how to's on the install