1K9
No'mo Rocket 4 me
If you read up on K&Ns, they can easily go 50,000 miles between cleaning, depending upon riding conditions, of course.
This RamAir had about 22K miles on it. It looked clean but, now that it's naked it's gota be squeaky clean. I like the looks of some K&N. Perhaps someone has a set gathering dust in the garage.