Eeyup thats about how mine looked when i pulled it, might want to pull the manifold and clean it as well that soot combines with blowby oil and makes nasty tar gak. I made a similar plate but I tapped my waste-gate line in the center to make it look important, NC only has visual inspections on diesels so if it looks stock-ish=no questions. Ever get a good boost reading?

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1991 300d 2.5 Turbo OM602