14 HONDA GL1800: Vance & Hines GL Monster Slip-On Exhaust (Chrome) The Gold Wing has one of the most loyal rider followings of any motorcycle. To design an O.E.M. quality muffler system to satisfy this loyal following Vance & Hines began with a clean sheet design. For starters, the engineers developed a sophisticated sound canceling chamber within each muffler that provides a perfectly measured increase of the exhaust note and produces a usable increase in torque and horsepower. GL Monsters are oversized slip-ons that feature an angular design finished with massive 6-1/4" wide machined billet end caps that elegantly accent the Gold Wing's bold stance.