Removal & Installation

Release screws (1) of rear muffler on intermediate muffler.

Installation: 

Tightening torque, see 18 00 6AZ in EXHAUST SYSTEM - TIGHTENING TORQUES .

Detach both rear mufflers from intermediate muffler.

Fig 1: Releasing Screws Of Rear Muffler On Intermediate Muffler

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Measure length (B) of pipe sections on new intermediate muffler.

Fig 2: Measuring Length Of Pipe Sections On New Intermediate Muffler

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Transfer determined distance (B) to new installed intermediate muffler.

Fig 3: Identifying Determined Distance Of New Installed Intermediate Muffler

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Cut through and deburr both exhaust pipes at determined point between catalytic converter and intermediate muffler with special tool 00 2 210.

Fig 4: Cutting Through And Deburr Both Exhaust Pipes

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Release screws (1) on rubber mounts and remove intermediate muffler.

Detach rubber mounts from old intermediate muffler and push onto bracket of new intermediate muffler.

Fig 5: Releasing Screws On Rubber Mounts And Removing Intermediate Muffler

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The apertures on the new intermediate muffler are sealed with adhesive film.

Completely remove adhesive film from new intermediate muffler.

Make sure there are no foreign bodies in intermediate muffler.

Fig 6: Removing Adhesive Film From New Intermediate Muffler

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Connect new intermediate muffler and catalytic converters using clamping sleeves.

Installation: 

Nuts point downwards.

Align clamping sleeves so that:

• separation point is in middle of clamping sleeve, and
• there is sufficient spacing to adjoining components.
  Fig 7: Connecting New Intermediate Muffler And Catalytic Converters Using Clamping Sleeves

  Courtesy of BMW OF NORTH AMERICA, INC.