I've got the 2e on my 05 TD4,fits a treat,no real hassle,You dont need other mods though I have bypassed the EGR.I also went for the pierburg MAF with the synergy.Loads of adjustment on it.
To be honest,it does pull a lot better,but I got it for the sake of economy,so maybe I should of got the 2e.Current mpg is 37.7,so not too bad.
Best thing you can do IMO is bypass the EGR,about £30 or so,better value improvement .