let me take the first crack at this one.YES.if you have $$$ then it will be no problem. simple mods will get you up to 100 hp quite easily.
Bigger pump, 10mm at least, bigger turbo, good intercooler and 2,5" exhaust is all you need for 150hp.
K24 or Garrett T3 should be OK to the task, shouldn't they?
yea a tdi will do that day in day out.....without blowing upthe big limit on the idi engines is all that heat is trapped in the head,its a killer on the prechambers,they will crack+stuff eventually