I agree with Mike on the disrupters but would suggest that you look into the sharktooth grate, which is a takeoff on welding sickle sections on the keystock grate.The Sharktooth has the sections bolted in so you can replace them easily and keep a sharp edge.Bolts offer a degree of protection should a small stone, wood or other tough obstruction get into the system because most times one side will shear and allow the section to rotate out of the way rather then break off and chance damaging the clean grain parts of the combine.Keystock grates offer a tumbling action of the material going through to allow better seperation of the grain still trapped with the MOG so some of the stems will roll over the sickle sections. The sharktooth "ribs" are smooth so stems are more directly slammed into the cutting edge and thus get more cutting plus there are quite a number of sickle sections ( can't remember but maybe as many as 20 in the 60 series and more in the 80).I have run in the same field in beans with a combine equiped with a chopper and from the cab there isn't much difference. If you get on the ground the chopper makes shorter pieces of stalk(lotta 2-3-4 inch pieces of stalks) while the sharktooth has more 4-6-8 inch pieces that are more mangled or shredded. Some advatages of the sharktooth over a chopper are ease and expense of maintenance,less power to run,no bottleneck in areas where you get into green or weedy conditions,help with roping in tough conditions and less wear and tear on the rear outlet area.