Yes, they make a clear powder coating. Looks great too, but I never used it on an intake though. It can take temperatures up to 400 degrees, but over that it will probably yellow too.
As mentioned before, contact Leanna at Phoenix Specialty Coating. I've talked to her before about a clear powder coat on an aluminum intake and she said the same thing about yellowing. But she has silver powders that look like blasted bare aluminum and they won't yellow over time since they're colored powders rather than clear. Take a look at her 'Alien Silver' for a little more underhood impact.
