For the full conversion your looking at:

Engine
ECU
Radiator & fan
Intercooler
Turbo unit
Wiring Loom, engine or full
Plenuim chamber
Boost hoses
Water Hoses
Exhaust
Air/Fuel Metering unit
Fuel Tank
Fuel Pump
Fuel Accumulator
Fuel Lines

I have most of these parts on the shelf but its a costly way to do it. Youd be better picking up a breaker ERST.

If you need the parts you know where i am! I would also reccomend changing the gearbox to a LSD one, which i also have handy

I done a full cabrio conversion and this was the minimum of parts i used.