Remove a engine cover.
Remove the front muffler(A).
Disconnect the front oxygen sensor connector(B).
Tightening torque
39.8 ~ 58.8Nm (4.0 ~ 6.0kgf.m, 28.9 ~ 43.4lb-ft)
Remove the heat protector.
Remove the exhaust manifold and catalytic converter assembly(A).
To install, reverse the removal procedure with new gasket.