V&H Dresser Duals are head pipes, and are sold without slip-on mufflers. The V&H website shows the Dresser Duals with a pair of Oval slip-on mufflers, which are relatively loud. Are you running the Ovals? If so, there are myriad slip-on choices, which can be run with the Dresser Duals head pipes or stock head pipes, which are not as loud....and some which are louder than the Ovals. Rush makes a great slip-on with several baffle choices ranging from not much louder than stock to so loud your head will buzz for hours after a short trip. I recently heard a set of the V&H Monster Ovals, and found them to be not too loud, but very deep sounding. They'd go great with a set of Dresser Duals, or in the configuration I witnessed, stock head pipes. Another great slip-on is the Hooker adjustable. You can close off the baffle, quiet them down and increase torque, or open them up and shatter glass. Choices are good.