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Dorman makes an aftermarket aluminum intake manifold. I'm not aware of any 5.4l engines that came with an aluminum intake manifold from the factory. Ford was getting better heat control out of the plastic manifold and therefore better gas mileage.
Are you interested in an aftermarket aluminum intake or are you hoping for something from the factory?
I'm sorry, I just remembered that the 1999 Ford f150 with the 5.4l came with an aluminum intake manifold from the factory. It should line up with your 2003, but that's the only year model that it came on so it might be tough to find.
The Dorman intake can be purchased from a number of sources.
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