I have put stage 4 installation guides for 2.0L WRX. Please follow the link to access installation.
VF34 install: DIY: VF34 turbo on WRX (with pictures!)
Pink injectors: DYI: Pink injectors on 02-03 WRX
STi TMIC: DIY: STi TMIC with Y-pipe on WRX
Helix catch can (reliability) mod: Helix catch can install on WRX
I did not post Walbro fuel pump install because it is a very simple mod. PM me if you need instruction.