C5 Turbo Problem

[Guest graeme01942]

:blink: whilst driving, once car has warmed up, around 2000 revs in any gear we keep hearing a noise coming from the dash/gear stick area dont know what this is. it sounds a bit like a whooo noise.can anyone help just might be something silly but need to know. the garage were we bought it from says its just the turbo kicking in but we av asked a friend who has an estate version and it doesnt happen with hers.