Whats the best way to get some air to the engine??

I have been looking around at some different options to get more air under the hood. Things like an intake, steel cowl hood, vents, ect.... I just want whatever is going to get the most air under there and i want to be able to really see a difference performance wise. Does anybody have any suggestions????

take your hood off... or 1/2" spacer on the hood hinges with vents, or cold air intake with a vent over the filter

No perceptable performance improvements are available through this option.