All 20 series are factory auto-guidance ready, no longer an option. Shield changed on the tailings, feeder changes (stripper position, chain slats, top drive sprocket design), unloader swing cylinder larger, unloader spout change (again), double click of shift button on MFH engages the auto-guidance, chopper brg housing RH side improved, rear discharge shields changed, knife bank position monitor for chopper vs rpm setting of chopper. Fan clean out door was mentioned and the service ladder. New options available, engine air compressor system- hyd folding bin extensions, hyd drive unload cross augers (independent operation of the main auger).