Vance & Hines 4 Round Twin Slash Slip-On Mufflers Want classic style and sound for your Harley-Davidson Touring motorcycle Look no further. These 4 Round Twin Slash 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: 4 slip-on mufflers with classic round bodies and twin-slash end tips All-mechanical straight-through louvered baffle generates more power along with a distinctive, throaty rumble Full-coverage heat shield blue-proofs your ride For bikes with electronic fuel injection, installation of the Vance & Hines Fuelpak or Fuelpak 3 (for 2007 and later models) is recommended