On AWD models, the exhaust manifold and catalytic converter are combined into a single unit called a "maniverter." To begin removal, raise the vehicle and support it securely on jackstands. Disconnect the exhaust pipe from the exhaust manifold; on some models, it may be necessary to remove the exhaust system to create sufficient clearance for the manifold removal. Next, remove the exhaust manifold heat shield and the manifold brace. Unplug the electrical connector for the oxygen sensor and then remove the oxygen sensor from the exhaust manifold. Unscrew the mounting bolts to take off the exhaust manifold along with the old manifold gasket. For inspection, check the exhaust manifold for cracks and any obvious damage, replacing it if necessary. Clean the threads of the exhaust manifold bolts with a wire brush and inspect for damage, replacing any that are damaged. Use a scraper to remove all traces of gasket material from the mating surfaces and inspect them for wear and cracks, taking care not to scratch or gouge the surfaces. Inspect the exhaust manifold mating surface for warpage using a straightedge and feeler gauge, checking the cylinder head surface as well; if warpage exceeds specified limits, replacement or resurfacing is required. For installation, use a new exhaust manifold gasket without sealant, install the exhaust manifold, and tighten the mounting bolts gradually from the center outward to the specified torque. The remainder of the installation follows the reverse order of removal.