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You are wrong in "assuming" that somehow you aren't making more power because of air density. The computer keeps track of that and is programmed for a given power level for a given air density as well.
Basically you need to change the tune. It is tuned for the power you are seeing at the elevation you are running at. Regardless of what you do you will not increase any more since it is programmed to give you want you already have.
The air box is NOT a restriction. This is known fact.
The intercooler is NOT a restriction. Again, this is known fact.
Once again, the engine combination CAN and DOES make more power than what they have programmed. Even in 100% stock form and function it is 100% capable of producing more than the factory has programmed it for.
GM programmed it for the power you are seeing, nothing more. If it is set at the air density you have to produce the power you make, ANY mods that you make are not going to change that "requested torque output" that the computer is looking for. Only a tune will do that.
Now, did GM get too aggressive and pull too much power out for the density you are at? More than likely as they like to be "highly conservative" in regards to keeping the engine out of knock (since knock with non-forged pistons and rods basically means broken parts and warranty claims).
I can see where you are grasping at straws because you really don't want to do a tune. But, you will find out that you won't produce anything more than the computer will allow in all cases. That is the key, IN ALL CASES.
Modern car computer systems are 1000% more complex and involved than anything from the previous decade.
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