my XB9s ran fine w/ the stock map when i 1st installed a hawk exhaust on it. except maybe for the popping on decel, which was pretty loud and excessive.
after a couple of months, i loaded up the standard race map and the bike's smoothness improved drastically. also the bike runs cooler, is easier to lug and ride at walking speeds, and gets better gas mileage. i didnt think there was anything wrong with it before (except for the excessive popping)but theres no way im going back.