Our Twin Slash 2-into-1 slip-on was designed specifically to work with the new 2-into-1's for the 2010 Road Glide and Street Glide. The new slip-on features a large 4-inch muffler body with our new signature twin slash end treatment. Utilizing an all new maintenance-free baffle and also minimizes heat discoloration, the Twin Slash 2-into-1 slip-on gives you the perfect blend of the performance and sound.