That particular part you are referring to is the anti-ice ring. hot engine compressor air is routed in there to keep ice off the intake. They start life being highly polished, almost chrome in appearance, but as time goes on they begin to abrade and roughen so the finish dulls. Same thing applies to the wing leading edges.
This gives you a lot of leeway in the treatment. Bare-Metal foil is the most realistic if you can get it to burnish down without wrinkles. Testors silver enamel replicates the duller finish well. Also, at the hardware stores, I came across a "chrome" spray paint that dries to a sheen somewhat in between the other two.