Depending on your definition of budget and how serious you are about drifting since this will be recreational…
You wont need the sways, tie rods (unless you plan to do off roading), tc rods, rad, thermostat, racing wheel/QR, or decent rims.
If you’re running stock SR, just run a regular SR rad and dont delete the fan shroud (I dont know why everyone does it). Run some stock wheels with 595s and you’re good to go.
And Jeff doesnt have an sti, so he wont be towing any 18 wheelers… or 240s, not that an sti could do that anyways. Wrx gearboxes will break if you dump the clutch in snow… (well… maybe not in snow… but in rain for sure!)
lol