Muffler
Components and Component Location
Components

| 1. Front muffler 2. Catalytic converter and center muffler assembly 3. Rear muffler |
4. Gasket 5. Hanger |
Repair Procedures
Removal and Installation
Front Muffler
Disconnect the negative battery cable.
Remove the engine cover.
(See Engine and Transaxle Assembly - Engine Cover)
Disconnect the oxygen sensor connector (A), then separate it from the bracket.

Remove the front muffler heat shield (A).
Tightening torque: 9.8–11.8 N·m (1.0–1.2 kgf·m, 7.2–8.7 ft-lbf)

Remove the front muffler.
Remove the front muffler hanger bracket (A).
Torque: 29.4–39.2 N·m (3.0–4.0 kgf·m, 21.7–28.9 ft·lbf)
Remove the front muffler (B).
Tightening torque: 39.2–58.8 N·m (4.0–6.0 kgf·m, 28.9–43.4 lbf·ft)

Install in the reverse order of removal.
Catalytic Converter & Center Muffler Assembly
Remove the front muffler heat shield (A).
Tightening torque: 9.8–11.8 N·m (1.0–1.2 kgf·m, 7.2–8.7 ft-lbf)

Remove the catalytic converter and center muffler assembly.
Remove the catalytic converter and center muffler hanger.
Remove the catalytic converter and center muffler assembly (A).
Tightening torque: 39.2–58.8 N·m (4.0–6.0 kgf·m, 28.9–43.4 lbf·ft)

Install in the reverse order of removal.
Rear Muffler
Remove the rear muffler (A).
Tightening torque: 39.2–58.8 N·m (4.0–6.0 kgf·m, 28.9–43.4 lbf·ft)

Install in the reverse order of removal.
Test yourself
A quick Kia Optima DL3 quiz: every answer comes with an explanation and a link to the manual page.