"there a popular mod to make a "homemade air intake". And a lot of people are getting better mileage"... yeah right.
The stock style paper ones, whatever one happens to be on sale, are what my stuff gets. Although, really, my stuff is on a 80,000 mile change out schedule. Not that they need to be changed then, but just out of guilt.
P.S. Almost all my vehicles have over 100,000M... one has 270,000M... so the evidence points to effective filtering right?