Before removing the exhaust manifold, it is recommended to detach the cable of the negative terminal of the battery. Then, safely lift the vehicle up and securely set on the jackstand, and then remove the engine splash shield at the passenger's side. Remove the upstream and downstream oxygen connectors and if the manifold is to be replaced both oxygen sensors ought to be removed. Remove the exhaust pipe from the exhaust manifold, disconnect the exhaust system hangers and put down the pipe assembly. Next step is to unscrew the bolts as well as take out the upper heat shield; then the exhaust manifold to cylinder head bolts as well as the exhaust manifold are taken out. Regarding installation, the mating surfaces should be cleaned from the gasket debris, and exhaust manifolds should be checked for distortion and crackages, using the precision straightedge when examining warpage. If a feeler gauge thicker than 0.030-inch can be inserted between the straightedge, and the mating surface, then you should take exhaust manifold(s) to the automotive machine shop for resurfacing. Install the exhaust manifold upside down with a new gasket and tighten the bolts by fingers only so as to observe the orientation of the gasket and the position of the cylinder designation as well as the exhaust ports. Loosen the bolts and then vice versa, starting from the center and moving to the edges to the torque indicated. Last of all, replace the rest of the components in the reverse order of removal, turn the engine on and look and listen for any exhaust leak at the interface of the exhaust manifolds and cylinder head; between the manifolds, the crossover pipe, and the catalytic converter.