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I have a 05 Z with single intake and the intake manifold has dark spots all over it. I would describe it as discolored. I'm afraid to try to clean or polish it since it is not a smooth surface. can i get some advice? anyone with a 03-05 also have this issue? everything else in the engine bay is super clean!
I know what you mean. I had this problem about 5 years ago and I used Nevr-Dull to remove the spots. It worked well and I have used it a couple times since and the intake remains spot free.