Cobra 4 NH Slip-On Mufflers For Harley Touring A discerning rider knows that sometimes loud alone isn't enough - your bike needs to sound good too. Cobra utilized extensive sound and dyno testing to create the 4 Neighbor Hater Slip-On Mufflers, which provide look, sound, and perform unlike anything else on the market. These mufflers will make your Harley-Davidson Touring motorcycle purr like a dragon. Features: Sound and dyno testing, lead to a muffler that looked, sounded, and performed unlike anything else in the market place The bodies start as round 4 tubes, then bell out to 4.5, for an aggressive and classic design at the rear At the end of the baffle is a trumpet shaped inner tip that works in harmony with the belled end, creating a unique look Rolled muffler tips give a clean, finished look 8 spun and louvered baffle produces an aggressive bark