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...
sean.kerwin Posted April 19, 2016 Share Posted April 19, 2016 Possible heat soak from then engine meaning more fuel consumption and slight loss in overall power, basically you want the air to be as cold as possible. Cold air is more dense and it burns a lot better. Sent from my iPhone using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
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