The TDI motor, most likely the ALH code is a nice base for this mod. Plenty of upgrade parts can be purchased here in the US. There is a difference between the 5 speed and the auto engines. If you can, try to get a auto. It has a higher diesel pressure pump and smaller injectors. Very easy and cheap to change the injectors to something bigger but not so easy to change the pump. The injectors alone will give you 20HP and 40ft.lbs for a misely $ 50.- used.

92 Xcab V6 4x4 SR5 5sp., Detroit locker rear, lim. slip front, Warn hubs, H4's, electr. fan, eng. oil cooler, 1 lift, open cat.