![]() ![]() Im considering buying a K&N for my M235i, if not for anything but to get a. It produced a 2-3 percent improvement in acceleration time versus the stock unit. Does drop in K&N air filter void warranty - Do you gain HP. For best results, use conical air filters with custom made. Like on the dyno, he sees incremental increases, with the K&N filter coming out on top. Yes, Expect a 5 increase in power and the torque & sometimes marginal increase in fuel efficiency. of torque, or around 2.6 percent and 3.7 percent, respectively).įenske also tests out the filters in a real-world environment, testing acceleration times between the four candidates. He finds that on the dyno, the aftermarket filters do in fact make more than the OEM unit, with the most gains produced by the K&N filter (around four horsepower and five lb.-ft. When you use the calculator to find the size of filter required for 400bhp, for example, multiply the calculated filter size for 400bhp by 0.4 or 0.3 to get a more accurate number. But not much.įenske put together a dyno test using his personal Subaru Crosstrek, comparing four different air filters: The dirty OEM item already the car, a new OEM filter, a cheaper aftermarket non-performance filter sold by CarQuest, and a high-flow performance filter made by K&N. The calculated filter size is around 200 the size of the actual filter. Well, Jason Fenske of Engineering Explained put these claims to the test, and it turns out that yes, high-performance air filters do actually yield more power. But being so cheap and easy to install, it's hard to believe these filters actually produce any observable gains. If you've ever been to an auto parts store, you've probably seen air filter boxes that claim extra power and more torque over the factory filter. ![]()
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January 2023
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