A residue management system comprises a chopper to chop crop residue, a residue spreader, and a floor extension. The residue spreader is mounted for pivotable movement relative to the chopper between a dispersal position to disperse crop residue and a windrow position to deposit crop residue in a windrow. The residue spreader comprises a first spreading device, a second spreading device, and a splitter positioned laterally between the first and second spreading devices to divide flow of crop residue therebetween. A floor of the chopper and a floor of the residue spreader are spaced apart from one another to define a gap. The floor extension projects rearwardly from the floor of the chopper partially over the floor of the residue spreader about the gap alongside the splitter to guide flow of crop residue from the chopper to the residue spreader.