Hey Travelguy, I would also like to know if anyone has noticed a "rod knocking" type of noise after they upgraded the intake setup. I went with the single "under the tank" K&N and every since, I've noticed a noise that was not there before, as Travelguy stated "equivelent to a bad rod" knock. I wonder if the "new" sound is related to the "noise path" being altered (shortened to be exact). I believe I can detect the new sound from both sides of the bike, which would lend to the centered air filter under the tank.
Any of you captains, who have gone with the "under the tank" model, have any new sounds of concern? Let us know if this is the "new" norm. I'm really considering a trip to the dealership.
See ya.