Center Muffler

Remove the RH floor under cover (A).

Fig 1: Removing RH Floor Under Cover
Courtesy of KIA MOTORS AMERICA, INC.
Remove the LH floor under cover (A).

Fig 2: Removing LH Floor Under Cover
Courtesy of KIA MOTORS AMERICA, INC.
Remove the bracket (A).

Fig 3: Removing Bracket
Courtesy of KIA MOTORS AMERICA, INC.
Detach the rubber hanger (A) from the center muffler.
Remove the catalytic converter and the center muffler (B).
Tightening torque:

39.2 - 58.8 N.m (4.0 - 6.0 kgf.m, 28.9 - 43.4 lb.ft)

Fig 4: Detaching Rubber Hanger From Center Muffler
Courtesy of KIA MOTORS AMERICA, INC.

NOTE: When installing, replace with new gaskets.
Install in the reverse order of removal.