I just bought new exhaust (full) and e-manage system for my stock 93 fd. will i need ney injectors or a new fuel pump

I've come to realize i will will have to have to install new injectors, pump, and regulater. does anybody know what size injectors should be ran with the new down pipe and back exhaust with an air box mod?

you wont need larger injectors. Your stock injectors will handle more mods than that, if anything you are going to need an ECU upgrade to compensate for the less restrictive airbox and exhaust so that it doesnt run lean.

the aem engine managment should handle the ecu. so when is a good time to get new pump, injectors , and regulater? and is investing in a new up- pipe a good idea? i'm really trying to get my car setup to where i can replace my bad stock turbos.