Citroen c5

Hi guys my mate has got a c5 and its a 2.0 hdi, it wont rev up and is smoking badly its just had a new turbo fitted and i found a vacume pipe had a hole in it that goes to the solinoid that controls the actuator so replaced that but its still the same anyone have any ideas thanks in advance

Anyone?

EGR faulty? why was turbo replaced? was it because it was down on power or low turbo pressure faults? does it have a FAP filter? could be blocked