I love my K&N, is seamed to give me quicker throttle responce and a little more hp up top. I use to have a pair of D&D slip-ons on my bike..... talk about loud and ballzy. I use to be able to do second gear wheelies at 30 mph with out clutching it up! K&N's are worth it, it's the only filter you'll ever have to buy for the rest of your bikes life.