Yoder Smokers ACS Full Performance Upgrade Kit includes High Flow Burn Grate has been redesigned with several crimps will prevent it from warping with heat. This will eliminate the need to occasionally reshape the burn grate. Furthermore, the air flow has been redesigned to more efficiently direct heat for EVEN BETTER consistent heating across the cooking chamber. The igniter sits inside metal housing which directs the heat towards the pellets in the burn grate. This creates heat with no direct igniter contact meaning your igniter will last much longer and stand up to heavier use.