i have done all the above on my diesel--just got the clutch now to get fitted to tweak the map for the hybrid turbo i have fitted
A stage 1 revo map will get you about 185 bhp and you can run this on the standard clutch--you don't change the pump on the maps on a diesel
Stage 2
is to decat the car so it revs better in the mid range then a full turbo back exhaust which can be either a milltek or contact Ncs on here who does them as well and are cheaper
Also either a panel air filter or the fancy intakes but heard these dont do any think on a diesel
Hybrid turbo--i have a Cr turbo stage 2 which is 220 to 240bhp (when i get the clutch done think mine is 200bhp at the mo but willknow better when i get it on the rollers-with a custom map its running on
turbo technics also do hybrid turbos as well.Look through my build thread its all in there