most boxes are just plug into f uel rail,and therefore just raise fuel intake,map for your car(if done right) will be done to specs on your turbo condition .clutch and gearbox,injectors pressure etc.as said dpf removal is a failure now but easily got round,so if you do remove it,get the dpf shell cut open,innards taken out,welded back up and deleted from the car along with the egr valve and eml light,simples