Vance & Hines Twin Slash Round Slip-On Mufflers For Harley Want classic style and sound for your Harley-Davidson Freewheeler or Road Glide 3 Look no further. These 4 Twin Slash Round Slip-On mufflers from Vance & Hines offer an all-mechanical straight-through louvered baffle, which boosts power and gives your bike a beefy, unmistakable sound. These slip-ons are also sold in pairs to ensure you get the best value when upgrading your bike. Features: Signature twin-slash end treatment Optional 4 Round quiet insert available (sold separately) Carb Compliant Sold in pairs Note: Image showing muffler installed with header pipes is for visual reference only.