xieds are a inline device that goes between you o2 sensors and your ecm to richen up your fuel ratio. you can get more infoe on them at nightrider.com.
Just put a set on my bike last night. \\; Produces a noticible difference in the way the motor runs. \\; More torque, smoother idle, no surge under 2500rpm, and WAY less heat. \\; This \\;with a totally stock motor and exhaust. \\; May be the best $100 I've spent on a bike. \\; Next step is to some sort of true duals.
 \\;
-Harry