Honestly I think you would be better of buying a pd150 and just getting a remap. the 150s stand up to alot more and you can take them up to 200bhp with pretty much a remap and can bigger turbo after that. once you start putting that sort of power into the smaller engines they don't last long, pd should have lift pump and the non pd doesn't (has mechanical fuel pump on front of engine instead) if you go for smaller engine you will end up going for forged pistons, conrods, head bolts, bigger injectors, turbo, and so on its not cheap. ££££ hope that helps if still fancy going down the expensive route give nother shout and tell you what you can do with the engines