if your mate and passionford say its fine then it must be! :rolleyes:
cos they know shitloads about 1.8Ts obviously and turbo chargers in general by the sound of it

i would say a vac hose is loose/disconnected or split in your engine
the 007p is meant to be quiet, if you reverse it, it'll make a high pitched 'ping' sound
 
Its pressure going back through the turbo, trying to spin it in the opposite direction!!!! Well, thats what i think anyway!
 
Its definatly wastegate chatter then mate which i dont think anything can be done about that but dont quote me on that tho lol. Definatly need to get it hooked up to vagcom to check why the engine management lights on tho