Cobra 3 3/4 Slip-On Mufflers For Harley Tri Glide Just about any standard pair of Slip-On mufflers can easily be bolted to your Tri Glide model, however expect the muffler to stick out like a sore thumb, get dragged when unloading, or damaging the muffler going uphill. Cobra's R&D team has your Tri Glide covered with their 3-3/4 mufflers fitted specifically it. The mufflers consist of a 2-1/2 perforated baffle that has been wrapped in fiberglass to allow for a deep bass tone. Features 3-3/4 muffler bodies radial slash cut aluminum tips 2-1/2 perforated constant velocity baffles Sealed pillow of woven fiberglass that wraps around the cores Deep thundering tone