Cobra 3 NH Slip-On Mufflers For Harley Sportster The all favored Neighbor Haters have been minimized into a 3 to accommodate for your H-D model. So if you're looking to get the most sound out of your machine and do not want a full system, these slip-ons are your answer. Features Turn that quiet engine into something all your friends will envy 2 inch constant velocity core for sound and performance unmatched Simple belled rolled end with an inner steel tip 3 muffler body