I have the AFE Momentum intake, I really like it! The sound is great, very deep and noticeable growl when under load but not overly loud and annoying. When towing you really hear the deep growl in the lower to mid RPM range, I get lots of compliments on how it sounds.
I also have the AFE TB spacer, I will say that this quieted the intake sound just slightly and made it a smoother growl vs an aggressive growl if that makes any sense.
In the upper RPM range when the sound starts to go away you can still hear it slightly but not as much in the lower-mid range.