soak it in a 50/50 solution of simple green and water for 24 hours. Wash with water and a brush, blow it dry with compressed air, then let it sit over night. Next take a steel bowl (or glass) and put 1 cup of lacquer thinner then spray Krylon Dull aluminum spay paint in the top of the lacquer thinner. Lightly brush the solution on the intake and let in dry. the thinner dries and the Dull Aluminum soaks into the manifold. It might take a couple of try to get it done the way you want it DO NOT Blast it.
Bill
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