I own a 2003 800 Dark and recently installed the Two Brothers slip on exhaust. After the install my bike has started to jerk and spit at about 3-4,000 RPM's. After checking the Two Brothers website I found that they haven't done any research on the 2003 bikes. As a result I have to figure things out on my own. Based on my findings, does it seem applicable to fiddle with my fuel maps (via a power commander), and/or install a more air-friendly filter?