Replaced stock air filter with K&N and Sound Comparison
I bought a K&N panel filter for my Focus, because I like the idea of re-usability and that I can refresh it more often. Obviously it will not make a difference without other mods. Or the difference is so little you won't notice it.
Music from: Free Music Archive - Computer Music All-Stars - Wheres My Jetpack
![](https://i.ytimg.com/vi/B86FnqtfH5Q/maxresdefault.jpg)