Vance & Hines developed a sophisticated soundcanceling chamber within each muffler that provides a perfectly measured increase of the exhaust note & produces a usable increase in torque & 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 goldWing s bold stance. The full-length blue proof heat shields cover both the exterior & drivetrainside components. The mellow exhaust note & the distinctive looks gL riders have longed in a system designed as well as the gL itself.