Markmartin01
Newbie
There is an episode of Enginemasters on Motortrend where they play with various air filters and configurations on a dyno. Granted, they were only testing single filter top mounted options on a carb, but the best possible config for HP on the dyno was an air filter that was breathing through the top, sides were closed, and sitting on top of a funnel. Makes sense that there is less turbulence straight down than from the sides and then 90 degrees down. In the end though, the aluminum tube cone filters are a gimmick. The good K&N does flow better than a stock paper element but it's breathing hot under hood air so the flow is negated. A good paper element in the factory housing with restrictions removed is the ideal situation.