Toothbar. Ordered one with the tractor. Used it for awhile then took it off before the first winter. Never put it back on. Maybe they help on a small
cut or scut with insufficient weight to push into a dirt pile, but on a 5425, I found it made no difference to the fels ability to scoop material.
Didn't like that some dirt always got trapped behind the bar and wouldn't dump out.
Will probably never put it back on.