Well Well, I just noticed this driving home today. Had window open as nice and sunny and heard it straight away. Bear in mind only had car from new for 3 days so wouldn't have thought there would be anything wrong with it!
It's very noticeable if you accelerate quickly in low gear then lift off throttle. Must be a dump valve surely? Whatever it is it sounds great.
Now guys/gals please go out and try it with window open to see if you can hear it to put our minds at rest.
Quick up-date on my previous post. I've spoken to the dealer as once I realised a diesel doesn't have a dump valve, I got pretty concerned because the noise certainly sounds like I have one.
Anyhow, head technician, mechanic or whatever they are these days believes it is just pressure release from somewhere and explained most turbo's have this. Erm well I don't know about that and the sound is very noticeable so not entirely convinced.
It could be that I'm just looking for issues when there aren't any. I mean there are no tell tale lights and power seems fine...
Anyone got any thoughts?