Yeah, I used to ride 4-wheelers and I had a Yamaha Banshee. It's a two-stroke twin of 350cc's. Probably the meanest one I ever rode. A company by the name of Boyeson makes aftermarket reeds, cages, and such. I had a set of their carbon reeds on the Banshee. The difference between those reeds and the stock ones was huge, especially with an exhaust upgrade. I may try to find some thin carbon sheet and mill out a reed to see what it does (after I finish the conversion).