Yeah it really depends on what you want out of it. It you want a safe daily car.

mani
t3 turbo
downpipe
bov
internal or ex wastegate (5-6 psi)
intercooler
piping
255 walbro
fmu
of course all you bolts, fittings, oil feed and return, tapped oil pan.
missing link

If you wanna get serious
Injectors
engine manage
tuning
and plenty of other stuff

You can find a garrett off of a saab, volvo, or mercedees, they work good for 4 cylinders.