No mate, it's not massively loud.
If I were to describe it, it's like when you lift off the throttle, the DV should retract and make a Tsshh noise.
On mine, when a lift to change gear or to slow down, it sounds like the air from the turbo is being sent back down the pipe making a 'howling' noise, almost like someone breathing down a pipe?
Noticed a lot more in Devon as more revs are required for the hills, I'm hoping the DV has simply stopped working but it won't have done the turbo any good