Looking for an upgrade for your 2001-2004 LB7 Duramax truck? Check out the PPE 116111000 Manifold Upgrade & Up Pipes! This kit includes two PPE Manifolds, two PPE Up-Pipes, and a PPE Down Pipe Support Bracket. The manifolds are made from aircraft-grade 304 stainless steel with increased inner diameter for higher flow and lower exhaust gas temperatures. This will help to accelerate turbo spool-up, increasing power and fuel economy while maintaining reliability. The kit also includes gaskets and bolts for installation.