I have a 2006 FLHT with Screaming Eagle Slip ons and a opened up air cleaner box. Can I add the K&N HD-1499 air filter? KN HD-1499 $81.75 - Replacement Filters, Replacement Air Filter I have a HD model Air cleaner in it now. It seems dirty although the bike only has 4,300 miles on it. I feel the bike has sat around more than it has been rode. Bought it used this January.