Exhaust Manifolds
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The exhaust manifolds are a one piece cast iron design. The exhaust manifolds direct exhaust gasses from the combustion chambers to the exhaust system. On certain applications, the right manifold has an outlet for the Exhaust Gas Recirculation (EGR) system. Exhaust system gasses are directed from the right exhaust manifold through the EGR pipe assembly and valve to the intake manifold. The EGR pipe assembly is retained to the exhaust manifold by two bolts and sealed at the exhaust manifold flange with a gasket. The EGR pipe assembly is retained to the intake manifold by one bolt and sealed by an O-ring seal. Each manifold also has an externally mounted heat shield that is retained by bolts.