I'm moving to Colorado in a few weeks, and I need to make sure my bike is going to be legal out there. I currently ride a 2011 450f, and it has the yoshimura RS-4D pipe on it. I love the look, sound, and performance of the pipe. The only issue is that yosh doesn't sell a spark arrestor for this model. Does anyone out there know of a universal spark arrestor that I can fit to the pipe? If not, is there an arrestor out there that I can use with the stock pipe?