So i finally installed the 02 manipulator by shiftech. Bike "feels" slighlty smoother, but under 2500 rpm, its still lumpy. On cruising between 3000-4000 rpm, bike feels like a horse in gait at steady throttle where is "feels" like there is a very very slight hesitation and then a slight lurch forward. Does the ECU have to adjust for the o2 manipulator? this happened running it in sport mode, DTC = 4, GPR exhaust, no baffles.