Vance and Hines now has Monster GL Slip-On Chrome Mufflers available for '12 and newer GL1800 Gold Wing and '13 and newer GL1800 F6B Models.
The Monster GL Slip-On Muffles have an over-sized angular design with massive 6-1/4” wide machined billet end caps, full length chrome heat shields and specially designed chamber baffles. V&H says the Monster GL Slip-On Mufflers produce a deep mellow tone as well as power and torque increases:

http://www.cruisercustomizing.com/va...13/part/V19407