It could be a turbo problem , the turbo side thats pumping air into the engine can wear at the shaft causing movement between the sides and cause the blades to touch the sides and break bits off or bend at their edges
causing the blades to make that kind of sound .
If bits and it would be gradual so like iron fillings actually made it past and through the intercooler they would probably just stick into the thick black sticky gunge stuck around EGR valve and elbow and inlet manifold ,
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