Been running the K&N in stock box for a while. It made an improvement with slips and fuel box. Just ordered the 51010 kit today. It's the cheapest option and gets the job done. I was going to do the decorative plate route and forced air intake but the cylinder fins are not finished like on other bikes. I don't like the look even with the plate. I'm going to try and get by with my Cobra fuel box with the air kit until winter. Then I will be wrapping my pipes and adding a PCV with ignition and autotune modules using the world famous David Sheek map as a base.
2011 Black Vaquero
V&H Slips, Thunder Stock Air, Cobra Fi2000r