From a standard base car You will need to upgrade/change:
1) Big turbo escort or 4x4 saff exhaust manifold, as the collector port is much bigger than the small turbo one. You might be able to port the small turbo one, but it's easier just to buy one.
£50-100 second hand
2) T34.48- with 360° bearing. Turbo was brand new, non-exchange direct replacement for the T25, I bought mine from Ian@Racetek, not sure what they are now but very reasonable.
£700ish
3) Water pipes to fit the T34, the T25 ones will not fit as they are smaller. Bout
£20 second hand off a 4x4 saff or big turbo escort.
4) Bosch 023 intank fuel pump, good foir 500ish BHP, either from Boschman off here or Matt lewis, don't need the fitting kit is a waste of time, about
£85-100
5) set of bigger injectors, 55lbs at the moment might change.
6) MSD chip module, not sure on the Price Stu is thinking of yet.
7) 3 Boost pipes, airflow meter to turbo inlet, turbo to intercooler and intercooler to throttle body,and a crossover pipe (RS500 style) with recirc valve pipework- you have to run a recirc dump valve on small turbos- Matt lewis
£130-180ish ( still in development to make it look tidy)
8) Recirc dump valve. Same as std 2wd/4x4 one, can have a second hand one for about
£10 or I have bought a new alloy one for about
£50
There are a few other odds and sods, but when the conversion is complete I will write up a fully detailed how-to guide with pictures and exact costings and suppliers. Sorry it has taken so long but there has been well over 13k invested in this project since last april 
