Aluminum intake clear coat?

Possibly.

There are several different formulations of ceramic (for polished metals, firearm coatings, exhaust, etc.) including newer temporary ones for paint, headlight restoration and trim. I'm happy to talk -- give me a call anytime after 10 a.m. central.

Here's their website if you care to see what's available.

Cerakote.com - Global Leader in Thin-Film Ceramic Coatings | Cerakote
They make clear coats that don't have to be baked in the oven. My oven was really stinky for quite a while. Didn't realize what I had bought.

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