Im looking at buying a wrx replica - it has a 1.8 engine, and was wondering if a 2.0 or a turbo could be fitted, its 4x4 so what sort of work is needed, i can get a turbo for £995 this is gearbox, ecu, loom, engine

so how simple is it not from here?

 

subaru have already done the work for you. much better, easier, and cheaper just to buy the 2.0 to start with

 

as said just buy a uk turbo or an import