Welcome to the fourm mate! Standard internals with the right fueling and supporting mods, most people run 200bhp on the standard turbo no problem, very reliable... I did for a year and now run TD04 unmapped and roughly the same power. Still running strong . If you have a good map the engine can handle about 240 but I wouldn't go past that without forging the engine.... If you forge the engine, the most I think I've seen from the 1.3 is 500bhp? Or that might be a 1.5 I can't remember.... Tuning is endless though my friend!!! 200bhp standard turbo, standard internals alllll day long