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yea id look at the exhaust manifold mine did the same thing and had to machine it, mind you this was before its 20k service and was done under warranty but check it out id put $ on that

Being that its more noticeable when cold says to me its an exhaust leak. As the engine warms up everything expands which will close up the gap making it less noticeable once warm. Im with everyone...

yep you may have developed a boost leak, check your pipes, intercooler (especially) and manifold

The turbo should or shouldn't have the whistle as it were ... if it "develops" a whistle, I'd suggest it's the manifold leaking, or the bush in the turbo (if not a bearing type). Nothing dramatic,...

Leak from somewhere? Possibly intercooler?

Mines doing the same thing, not over concerned, You may like to disconnect
the battery for an hour,

Plenty of fish in the freezer now.

Oh yeah, and that is a 11ft croc in the last pic, No swimming in this river. Is a nice reminder to stay croc wise whilst travelling in northern QLD