If you want great looks and sound for your Triumph 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.; ; Twin Slash Duals produce a deep and hearty rumble for the Thunderbird's massive 1700cc parallel twin power plant 4" round mufflers 2-1/2" mid pipe heat shields Optional quiet inserts available Chrome finish