I had a GS boxer for ten years / 125,000 miles which I absolutely loved. We went to Alaska and anywhere else together. Not even once was I concerned how it sounded, in fact rather than the usual exhaust sounds, it sounded like a sewing machine ;-) , and I loved how it purred in the long rides and hummed like a little airplane engine. They should have gotten a Moto Guzzi to stir the soul! But they are hard to come by. LOL. https://youtu.be/_jAb0kWJHxY?list=PLWjAN50JJuf7pSokRySSt607W7w3NQdl-