How much?
 

What should I be looking to pay for the following?

Supply and fitting of... VF34 Turbo, STI Pink injectors to my 2002 WRX, obviously I would need a remap (already ECUTEK'd) as well.

And before people say it, yes I have the STI TMIC, 3' system and uprated fuel pump already.

I'm currently at 270BHP and 286 lb/ft what should I expect?

Plus any recommendations in the South East (West Sussex) for the work?

Nobody had this kind of work done?

Don't know how many hours it takes to fit a turbo and injectors, but those mods with upped boost in the remap should see you to easily 350bhp...