how the bike runs. I just installed a devil SB2 slip on and when every I go over a bump, my bike has a BIG hesitation. Just like as if I were to close the throttle and open it again very quickly. The exhaust could not have had that big of an impact, could it? Then I think it could be the cold weather. It has been in the 40's when I took her out twice. Maybe a combintation of the weather and the slip on. This is my first bike so I do not have any experience with this. Could the carbs be a little dirty? It has only been in storage for a few months. Its an 02 ZX-6R if that helps.