[rppngears]

I somewhat disagree with you guys, I think the tank of air if engineered properly and compressed with a compressor before hand, could somewhat increase his horsepower for a quick burst. Once the air enters the Intake and mixes with air at 14.7psi, it will dissapate and drop in psi, but it will still supply more volume to his engine. After all, why do people put ram air kits or K&N's on there cars, or put radical cams in?? It allows as much air in as possible at 14.7psi, and for the cam it also does other things too. It is not meant to replace a turbo, or to supply "boost" in any way, but it will make sure the engine has as much air as can be crammed into the cylinder at that pressure. And you might end up getting some boost if the air in the bottle is pressurized high enough that when it comes out of the bottle an reaches the intake valve, it was not able to fully dissapate.
I also agree that it is not a practicle way to gain horsepower. The amount of time, effort and money would make it worth it to just go buy a nos kit. Nos is really doing the same thing, its just a more efficient way to store oxygen, chemically. But, if you wanted to do it just to do it, I think it might give you something, about as much as a ram air kit.