drop in filter

I'm debating getting the drop in K&N filter to replace my stock filter in my 2010 V6. I was just wondering because I've heard varying opinions. Is it worth spending the 45$ on and if so what improvements will I see, sound, hp, mpg? Thanks

Hello everyone, yesterday I got my first mustang. Its a 2001 gt. So far I love it. I have a few questions: 1.Tomorrow I am going to be purchasing a replacement drop in filter. Other than just putting it in like you would a regular paper one is there anything else I need to do, even though this...