The 96+ Vortec intakes flow more than enough for these trucks, and already grab cool air from outside the engine compartment. You'd be much better off spending that money on exhaust components or a tune if you want any real improvements. I'm actually in the process of swapping back to a factory intake from a K&N FIPK on my red truck. (For a bunch of reasons) The only thing I'd look into is maybe grabbing a factory K47 (high capacity) air box from a salvage yard if you don't already have one in your truck. They take a slightly larger filter than the standard boxes. Straight swap, no other modifications necessary. The gas truck K47 boxes look like this.
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If you absolutely must have an aftermarket intake for looks or noise or whatever, get a Volant. They're the only brand on the market for these trucks that use a sealed box design which draws cool air from the factory hole in the fender. The rest (like K&N) are an open box design that pull hot air from inside the engine compartment.