Saturate all bolts and nuts with penetrating lubricant.
Disconnect the downpipe from the manifold(s) and discard the seal.
Support the catalytic converter and disconnect the downpipe. Discard the
gasket, if used.
Installation is the reverse of removal. Use new gaskets and seals. Tighten
all fasteners to 23 ft. lbs. Make sure that there is sufficient clearance
around all parts.