Removal of the exhaust manifold requires first, you have to disconnect the negative cable of the battery after which the pipes of the air injection system are taken off. The second step is to remove the air injection fitting, retaining bolt and oxygen sensor and snap off the heat shroud. Put penetrating oil on threads of cylinder heads and catalytic converter retaining studs and leave it to soak ten minutes. At the engine, take off the nuts which hold the exhaust manifold on the cylinder head and the catalytic converter. Loosen the manifold, remove it disconnected with both the cylinder head and catalytic converter and take it off the engine. To install, make sure to remove all the gasket material off the manifold and the cylinder head with a gasket scraper, being careful not to scratch the aluminum. Install the new gaskets on the manifold, position it on the cylinder head, briefly install the retaining nuts, and install the nuts and bolts of the catalytic converter. Lastly, screw on the manifold nuts to the required torque starting at the center and a criss cross configuration.