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Spectre recommends properly cleaning your filter once every 7,000 miles for best results, but the specific interval depends on the type of climate in which you you live. They do not need to replaced they can be cleaned, re-oiled then re-used. Like on the dyno, he sees incremental increases, with the K&N filter coming out on top. Spectre air filters are similar to K&N air filters. 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. 99-0635 K&N Power Kleen, Air Filter Cleaner - 1 gal. 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. 99-0621 K&N Power Kleen Filter Cleaner - 32 oz Trigger Sprayer. 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.
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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. K&N replacement air filters that fit in the factory air box can go up to 50,000 miles before cleaning is required and large conical filters on a K&N air intake. 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.