Conversely there are some tuners that reccomend that an intercooler should be replaced if you are running more than 200bhp on a PD150 engine. I like to have a balanced opinion personally. I listen to what people say on here, but I also talk to tuners, mechanics, and a mate that drives in the WRC (Guy Wilkes), who has a PD150 Leon. So all in all, I would rather improve the hoses (which I have done already), and start to look at the intercooler.
Oh and by the way, Forge dont do a hose kit for the PD150 engine