Is this oil residue anything to worry about?

[ClarkWGriswald]

Thanks for the detailed answer! The truck has 764076 miles. I do a fair amount of idling hauling corn. Not sure on the age of the turbo but I'm certain it's not original. The crank case filter is drilled out and has been for at least 30k miles when I first bought the truck. Running the m'm^2 tune but haven't had it fine tuned by anyone. My pyro is setup on the outside of the exhaust manifold and gets into the 500 to 550 range on 90° summer days. I'll take the pipe off and see what the inside looks like when I get home tonight.