I heard that all the '10's were getting them which is why I bought an '09. CAT's do nothing to prevent global warming, they actually make more CO2 as they burn off unburnt fuel, they do however prevent smog. Just like cars I would have to think somone will make free flowing CAT's for high performance bikes, although that is going to make for an expensive set of head pipes. Has anyone heard of any? I personally think bikes are a green statement already. We are using far less fuel than someone driving a 3000 lb SUV. I have a coworker who drives a Prius since his commute is 75 miles each way, broke his heart when I told him that my bike gets better fuel milage.