Exhaust Manifold: Description and Operation

DESCRIPTION

Thin-wall air-gap construction for the exhaust manifolds reduces underhood temperature by keeping heat in the exhaust stream. This also allows the catalytic converter to be mounted in a more advantageous position for packaging, under the floor instead of close to the engine. Stainless steel inner manifolds, separated by an air space from two-piece stainless steel outer shells, reduce heat loss to the air in much the same way thermo-pane glass reduces heat loss through windows. Hydro-formed inner manifolds, through which the exhaust flows, provide precise dimensional control. They are assembled to the cylinder head flanges, exhaust pipe flanges and the outer shells by laser welding.