I wrapped my header just past the muffler junction with header wrap. Deffinately makes a difference in the felt heat both at the header and the exhaust end. Just rode highway speeds, and it would pop after running hard up to 55-60 if I chopped the throttle. Not always but enough to notice. Absolutely nothing else changed from last year. Re-jet, up the needle, or run it. It ran great getting 42-43mpg on pavement and 35mpg off road.