I have the two piece diffuser and just got the Yoder Smokers YS Series Pellet Grill Expanded Metal Cooking Grates. They are amazing because you can just lift the edge of the left grate, slide it over the right one, open the diffuser door and slide the grate back. Boom, you are open flame cooking. I love to finish the filet over the flame for a few minutes. I hope this tip helps some folks.