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The stock airbox is very restrictive. A short ram intake will open it up a little bit and also bring in warm air from the engine bay which will increase FE. It also has another purpose if you have lean burn engine. On a lean burn the intake temps need to be around a certain number for it to engage so those drivers want warmer air intake temps.
But why buy the piping or filter in the first place? If all you need is warm air from the engine bay, why not just cut some holes in the current stock airbox? Cut the holes so that the air still has to pass through the filter to get into the intake, and make the holes point toward the engine. Maybe cut slots instead of round holes in order to keep unwanted objects from getting in.
This is what I plan on doing because its free and you keep the stock look and you can still buy oem air filters.
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