Hi All, on my 2011 XF S 3.0D I have a strange boost leak.

There are no codes and no restricted performance but there is definitely a loud boost leak which sounds like it's coming from the drivers side, in the past it's had a new intercooler and both inlet manifolds have been replaced, with those leaks I had restricted performance straight away so its a bit weird that I get nothing this time.

I've checked for any obvious pipes and I can't find anything but I'm starting to think that perhaps it's the standard recirc BOV leaking air back into the intake, as it's being recirced the MAF is still able to account for it and doesn't put any codes up, anyone had anything similar before?

It still pulls well and doesn't heavily black smoke although there is some, I'm obviously being gentle with it currently not to put too much strain on the turbo(s).

Any advice would be happily received!