Not a jerk when giving an honest answer.!
1. I did the underseat K&N - it did diddly squat
2. Took the filter cover off and Popped the rivets on the plastic seat breather - diddly squat again, but maybe dropped 2lbs
3. Went to the under tank K&N - more diddly squat (probably worse as its sucking in hot air off the engine, blocked by wires and frame on each side and no air where the tank hits).
4. Went to the smaller RU-2780's under bear claw, Jardines, PC, $400 Dyno tune. 124HP to 149HP. Yippie!
5. Cut the bear claw around the filters and put a hole in the front - Maybe a tiny bit better but not noticable.
6. Removed the cut up bear claw and I think it looks meaner without it.
7. Upgraded to the taller K&N RC-3680. Much prettier with the chrome tops but even louder though. A
I assume they pull in more air but I would need to remap on a Dyno and am too cheap to pay for that as it runs just fine for me.