Thanks for the reply's guys. The noise my rig makes is kinda simmilar to that ute above but more of a whoosh. Maybe i do have an air leak somewhere. Ill check all the piping for the turbo and intercooler on the weekend while im fitting up my pyro and boost guages.

I have been suspecting a leak on the base of the turbo where the intercooler piping runs as it has a bit of oil around it like its leaking from the hose? maybe this is where it is.