Looking for a way to upgrade your 2006-2007 LBZ Duramax truck? Look no further than the PPE 116111600 Manifold Upgrade & Up Pipes. This upgrade will increase your vehicle's power, fuel economy and reliability, while also lowering exhaust gas temperatures. The bellows are made from aircraft-grade 304 stainless steel for increased durability and the inner diameter has been increased for higher flow. The set includes two PPE Manifolds, two PPE Up-Pipes, a PPE Down Pipe Support Bracket, PPE 304 Stainless Steel Manifold Gaskets and Up-Pipe Gaskets. The Manifolds have bosses that are pre-drilled and tapped 1/8 NPT for EGT Gauge Sensor.