EliteMotorSports594k Posted April 18, 2016 Share Posted April 18, 2016 Hello, New to the club. Wondering I drive a 2014 Ford Focus SE standard 5 speed. I bought a K&N air filter replacement P#E2993. I was curious on how the car would run with the Air Box cover off. I noticed a immediate different as far as acceleration. As adds a pretty aggressive sound from the engine bay. I was just wondering if there are any down sides to this. 1 Quote Link to comment Share on other sites More sharing options...
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