Having been around racing motors and such. If this was me. What I would do is get the intercooler cleaned out. Take all of the inlet piping off and clean it out. Remove the inlet manifolds and clean them out. Reassemble everything. And enjoy driving a boosted Z. Aluminum flakes passing through the motor won't do much. The heat from combustion will burn them up, and split what remains out the exhaust. I've seen motors take in a lot worse and keep on going.
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