HoughMade - I'm eager to find out how your quieting works. My Hua Sheng / Hoot is loud to the point that after a 20 mile ride last weekend my ears were ringing. I didn't realize it until after I got off. I'm loath to ride with ear plugs, and don't want to rattle the neighbors either. Since then I've tried adding an ATV muffler on the end of the stock muffler (on-the-rack test) and discovered that the vast majority of the noise at running revs comes from the engine itself. On the way home tonight I was musing about adding a sound-dampened engine cowling, perhaps made from a mini-cooler or a plastic wastebasket lined with closed-cell camping pad. This thought triggered by the Honda "super-quiet" generators that are in boxes, so clearly you can enclose them to a great degree and not have them burn up. So...I await your results.