It all depends on what power you want, what you use the car for etc.
tom suggesting a supercharger over turbo??
For 300-350 save yourself a small fortune and just buy a Jackson Super Charger, or if you want a bit more poke get a Rotrex.
If you really want to go turbo, a Garett GT28 turbo will be plenty enough. 440cc Injectors will be fine for that power but you will need to swap them out if you want more power.
Yeah want to go boost, I will buy a turbo and get manifold made up for it, where is best places to put oil feed and oil return on the k20 lump?
You can buy diy turbo kits from TDi North
Standard ask for advice, then ignore followed by bud and Saxo. Is this really what type r's have to look forward to