Nope. No reverse bars - very important! Extended cylinder bars to discharge made a little difference but we got good straw from our R50 w_out any mods. Keep combine full - we cut low to keep a lot of material running through to push straw faster. In down oats, light crop, etc, ours will chew straw too when we can't keep it full. Oat variety makes a little difference but not much. Barley straw gets chewed up more so than oat straw. Tom langan