Turbo necessities?

Hey guys i'm finally starting to piece things together and was just curious what i need and what is optional as far as the turbo build i already have an upgraded clutch and aem uego wideband. I know i need a fuel pump but i've heard that on low boost setups you don't need to upgrade injectors. Do i really need an oil catch can, 440 cc injectors, 5 bar map sensor, stuff like that? Thanks
 
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