While my engine has been idling during a transmission oil check I'm getting a strange gurgling, sucking crackling sound from the passenger side air box inlet on the front wing.
If I give it a quick rev it stops and can hear nothing but returns a minute later.
I know that filter is for the second turbo and I have done the actuator update.
It has had new plenum connectors.
Any thoughts please?
Thanks Kev.

There is a diff breather hose that outlets nr the NS airbox or I think may even plug into it 2012 TDV8 Vogue (L322)

Thanks JayGee. It sounds like when you're trying to suck the last bit of a milk shake through a straw. I can hear it through the inlet on the outside of the wing.
I'll take the airbox off and have a look
As far as I know that air filter should be completely inoperative at idle.

Looking at the workshop diagram the front diff breather doesn't go into the NS airbox but just exits nr it. 2012 TDV8 Vogue (L322)