even a cheap ebay intake will flow much better than stock. have you seen the diameter of an aem cold air intake? it's HUGE, and you have alot of restrictions in your airbox. I would not advise the ebay route, The filter media is nothing compared to your k&n, or aem. I have a volant. its awesome.
Whatever you do, dont get a short ram.
And you won't have heat soak if you wrap your header!