Mufflers that compliment your Gold Wings' motor, what more can you ask for? This pair of Tri Flo 4.5" slip-on mufflers is what you have been missing as it produces a deep mellow exhaust tone. The Tri Flo slip-ons begin as 4" then expands to the final 4.5" tri-oval shape at the end.; he Tri-Flo is a classic Cobra design that mates well with the lines of the Gold Wing The 4.5" Tri-Flo slip-on mufflers produce a deep mellow note that complements the smoothness of the GL1800's engine Machined aluminum tips polish off these easy to mount mufflers These slip-ons start as four" round bodies where they meet the stock head pipes, then expand to their 4.5" tri-oval shape at the rear, before being capped off with beautifully machined chromed tips Installation couldn't be much easier, and the deep sound gives the Gold Wing a deeper tone without a whole lot more volume Passengers especially will appreciate the improved exhaust note that retains the Wing's remarkably civilized voice Limited Life Time Warranty