Vance & Hines 16837 3 Round Twin Slash Slip-On Mufflers For Harley Dyna The best price, the best looks, the best performance. The new Twin Slash Series of slip-on mufflers for touring models takes the best of the line-up and redefines performance, looks and price with a distinctive style and unmistakable sound that is only available from Vance & Hines. These new slip-ons give you the unique Vance & Hines twin slash look that&#39;s blue-proof thanks to its 2-1/2-inch full coverage mid-pipe heat shields matched with 3 or 4-inch muffler bodies built with louvered-core baffles pre-installed. With the Twin Slash slip-on, you will also get the benefit of increased performance and the bellowing throaty growl of a Vance & Hines exhaust.Best value touring slip-on.3 or 4-inch round with signature twin slash end treatment.Full coverage muffler heat It is recommended that new exhaust gaskets and a Vance & Hines Fuelpak be installed when changing an exhaust system on a fuel-injected motorcycle.Note: For closed course competition ONLY.