According to standards from 1997 onward, you have to do two steps before taking away the left exhaust manifold. Start by removing the oil dipstick tube bracket from the engine, then loosen the EGA tube's connection to the exhaust manifold and unscrew the EGA valve. When getting at the manifold, cut off all tie connections between pump hoses and pump. Put on caps to protect the open end of hoses, and use zip ties to relocate hose ends and close the path. Take these steps when removing the right exhaust manifold: take off the heater hose bracket, then disconnect both heater hoses. Lift the car with jack stands and remove the exhaust pipe from where it connects to each manifold separately. Make sure to turn the air suspension switch to the OFF position before lifting the car if you have Automatic Ride Control (ARC). This stops damage to any ARC components from happening. Take out the bolts and the exhaust manifold from the cylinder head. Before putting things together, use a scraper and solvent to remove dirt from the three mating surfaces - the cylinder head, exhaust manifold, and exhaust pipe. Spread some graphite grease on the cylinder head connection, put the intake onto the head, and tighten all bolts at identical torque numbers. Our engines permit direct fitting without a gasket, provided the parts are smooth on each side with no surface problems; if not, aftermarket gaskets or specialized repairs are needed. Attach the exhaust pipe to the manifold and fasten the nuts evenly while maintaining the correct torque force. The remaining part of the installation process goes back through the steps in the opposite order, and when you took off the heater hoses, make sure to refill the vehicle's cooling system. Start up the engine and look for any smoke escaping from the exhaust system.
