Wehrli 06-07 Chevrolet Duramax LBZ 3in. Y-Bridge Kit - Gloss WhiteThis LBZ 3" Y Bridge Kit is an upgraded high flow intake kit for the 2006 2007 LBZ Duramax which replaces the OEM upper intake manifold supplying air to the engine intake runners. The OEM Y bridge for these trucks is a poorly designed, slip fit style two piece bridge with very little support and is prone to blowing apart under boost on hard working and high performance trucks creating poor drivability and decreased power. This kit is a much improved,