I have the K&N panel filter and honestly very pleased. Obviously it doesn't add any power but it does give the engine a nice grawl above 3.000 rpm. I've heard that you get it more with the Afe, some even say it's too loud. The sport panel filter is just about right sound-wise. And if you don't have the sound generator, that might be a good option also, but again, just for the sporty sound.