I will say pay close very attention to the scale on the graphs and bar charts showing the gains you get with air intakes. If you don't know the symbol for units on a graph, look it up. Understand well enough that you can visualize the tiny amount if air involved per unit of time in the additional air flow, if the graph is even demonstrating gains in air flow. For example one graph I have seen showing a whopping 33.5% gain in flow is labeled as "Flow measured at 1.5" H2O" which, unless your air intake is going to be taking water into the engine, seems to be telling you how much hose water is going to spray back in your face when you wrench it out. (aka "rinse" it out, as fancy people say.) The astute customer will realize the seller is being 100pct honest to people who take the time to read between the lines. The only real gain is that filter's washable and thus reusable. Maybe you could have four of them for less than the price of a V4, use 'em all in track weekend, take them home, wash them out (careful of your face), let them dry, maybe help that with a fan, reuse them next track weekend and every track weekend. (No clue if tracking is that hard on air filters to where you'd use 4 in a weekend, just sayin' that sort of gain is what you are really getting: Washabilty. Period.