why would you want more noise for? so, the louder it is so people can look? or so cops can hear it better? there is a reason why the Joe z and f-sport still use the stock airbox. more noise doesnt equal more power. if you apply the same analogy to exhausts you can remove your stock exhuast completely and it will be really loud, but you will loser power doing that.

 

same thing why you have a sub at the back of the car.
sound of the engine is music, at the appropriate level that is.