it all depends on how much you want to spend skys the limit but a low boost turbo kit wouldnt require you to change internals and you will find you
ecu will only need flashing and possibly a light tune for a good power increase guessing i would say 30 to 40 kw and maybe extra 60 to 80 NM torque which doesnt sound much but it will make the car drive so much nicer. Google mondeo turbo kits has to be alot of people who have done it