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1810031 Replacing rear muffler (N51): Notes

WARNING: This page is about a different car, the 2011 BMW 328i, 2010 BMW 328i, and 2009 BMW 328i. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Scalding hazard!
Only perform these tasks on an engine that has cooled down.

Support rear muffler with special tool 31 2 220 .

Fig 1: Supporting Rear Muffler Using Special Tool 31 2 220
G04774161Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: If the cutting line is not marked by a punch mark in the pipe, determine the cutting line by means of the pipe length on the new rear muffler (4).
Carry over cutting line to faulty rear muffler (4) and mark out.
Fig 2: Identifying Rear Muffler Line Cutting Position
G05758989Courtesy of BMW OF NORTH AMERICA, INC.

Cut exhaust pipe at marked point with special tool 00 2 210 and deburr.

Fig 3: Cutting Exhaust Pipe At Marked Point Using Special Tool (00 2 210)
G04742078Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten nut.

Tightening torque 18 20 4AZ .

Fig 4: Locating Nut
G05758984Courtesy of BMW OF NORTH AMERICA, INC.

Release screw on right bracket.

Tightening torque 18 20 5AZ .

Fig 5: Locating Bracket Screw
G05476212Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Connect front muffler to rear muffler by means of clamp and align.

Centre clamp and tighten down.

Tightening torque 18 20 8AZ .

Fig 6: Identifying Centre Clamps
G04742081Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Check exhaust system for leaks.
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