The exhaust manifold is a component of the exhaust system used to collect and carry hot exhaust gases away from the engine. Made from cast iron or stainless steel the exhaust manifold combines the exhaust gases from several cylinders. The exhaust manifold is bolted to the cylinder head with a exhaust manifold gasket between them. The left (front) exhaust manifold connects to a crossover pipe that carries the exhaust gases from the front of the vehicle over the transmission to the right (rear) exhaust manifold. The gases are combined in the right (rear) manifold and directed on to the three-way catalytic converter pipe that is mounted to the flange of the right (rear) exhaust manifold. The three-way catalytic converter pipe is bolted to the right (rear) exhaust manifold with a converter pipe gasket between them. The right (rear) exhaust manifold also includes a tapped hole that the heated oxygen sensor (HO2S) threads into and a flange the exhaust gas recirculation (EGR) valve pipe bolts onto. An exhaust manifold heat shield is mounted on the each exhaust manifold.