Wehrli 11-16 Chevrolet 6.6L LML Duramax High Flow Y-Bridge Kit - Illusion PurpleThis LML Y Bridge Kit is an upgraded high flow intake kit for the 2011 2016 6. 6L Duramax diesel engine which replaces the OEM upper intake manifold supplying air to the engine intake runners and cylinder heads. The OEM Y bridge for these trucks is a restrictive part that creates a bottle neck in the air intake tract and limits engine performance potential. This kit improves air flow by 36% using a precision CNC machined cast aluminum high flow bridge