What's the actual difference between stock and aftermarket? Been reading various threads with interest and noted increase in HP due to more air being taken in. Been reviewing various products and pictures of same and a bit puzzled as to what the difference really is.
From what I can tell the only difference is that the aftermarket products are not completely enclosed. Is that it? According to the stock intake (as below), there's that seemingly tiny inlet to the side of the filter housing then the plumbing to the engine. Most if not all after market products reveal just the filter in an open housing. I would take it that the pipes to the engine are all the same diameter?
So what is the difference if you simply remove the cover of the housing on the stock filter and leave it open? Bypass the tiny inlet (block it/cover it etc), leave the filter housing open and draw the air directly from there.
Last picture is an aftermarket conical filter in a stock filter housing. If you leave the cover of the filter housing off, it pretty much looks the same as every aftermarket product for 400 dollars out there?
[3rd pic is mopar '10 after market setup 350 dollars]
Am I am missing something?