Originally Posted by SubarusRmyThing
if your going to go vf39 you need to do it right. you need to swap out to atleast an STi fuel pump. which can be had for 20 bucks used... You need STi sized injectors or larger. and you really should do the STi intercooler.
you dont need a tune to drive it with the vf39. i put a 39 on my buddys wrx and he drove the living piss out of it on his tune he already had and it still made a noticeable difference in power. How ever a tuen would be highly recommended.
You dont need any fancy tools to do this swap. it should take you about an hour max. theres only 5 bolts holding the down pipe to the turbo. and 2 holding the down pipe to the exhaust. 4 bolts stoping the intercooler from coming off, and i cant remember how many bolts stoping the turbo from coming off the uppipe, but its only like 3 or soemthing, disconnect the couple coolant lines and pull the turbo out the top, and put the new one right back in. its a very simple swap.
how ever the price of a vf39 used vs a new td04 used.. its nearly twice as much. So might just think about going td04 again unless your really wanting to do soem power. in which case i would be switching to a 04 STi ecu, so you can run an acess port or UTEC.
Although I think the original poster has the info needed. I just wanted to clarify this above post and add a few things for future use.
for a VF39:
STI fuel pump= not needed, the only real difference is the baffle thingy.
STI injectors= come standard on baja turbo.
STI intercooler= either USDM or JDM will work fine, but it is a good idea, be sure to get the bypass valve and Y-pipe with it.
You most definatly do need a tune. Just the Wastegate duty cycle mapping alone will cause you to waay over boost with the larger VF-39 (trust me, I have done it).