I'm certainly no expert. But one thing i can say thru experience in jetting my bike till it was at it's best is this. To those who say a uni or K&N or even a drilled bottom did nothing for them, that doesn't mean they didn't increase airflow. Whether or not you can feel a difference depends on where your jetting is at the moment that you try it. You're adding more airflow, so if it's already on the lean side you'll feel anywhere from noting to the bike running ragged and even stumbling. If it's a bit rich to begin with you'll then feel the difference.so if you felt nothing chances are you would have if you threw a shim on or got smaller needles, while if you did that w/o adding the filter the bike may have been too rich. It's a balancing act and you can't just add one thing w/o adding a balance of the other, IE:fuel vs air.
Thats just a basic theory that is more complicated than just that. But thats what i find when playing with my intake and jetting. When i installed my UNI i felt a difference. Not big, but there none the less.
