custom turbo kit help

From reading around this is what it sounds like im going to need and id like some feedback on other things that would either drastically add to reliability or performance or both.... Keep in mind im only going to run 6-7psi

Turbo (undecided but im thinkin T3/T4)
Manifold
downpipe
piping to throttle body
wastegate (i was thinkin 38mm external)
BOV
fuel management system
oil line to turbo....

An intercooler will be a lil later but right now im pressed for money which is why im not doing a kit just putting together. But is there anything im missing?

What kind of car? Because your probably going to need a new fuel pump, injectors, maybe an intake manifold, there has to be more but I can't think of any right now.

92 prelude si...i know in most premade kits they dont have intake manifolds so i doubt that, and i was hoping by running small boost i wouldnt need bigger injectors n a higher capacity fuel pump