Overview - Muffler

Fig 1: Identifying Muffler Overview

Courtesy of AUDI OF AMERICA, LLC

1. Bolt
   • 23 Nm
2. Suspended Mount
   • Replace if damaged.
   • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
3. Center Muffler
   • Original equipment as one unit with rear mufflers. For repairs, replace each separately
   • Separating point, refer to MUFFLER, REMOVING AND INSTALLING .
   • Align the exhaust system free of tension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
4. Rear Muffler
   • Original equipment as one unit with center muffler and tailpipe
   • In case of repairs, center muffler end muffler and tailpipe should be replaced individually
   • Separating point between the center and rear muffler, refer to MUFFLER, REMOVING AND INSTALLING .
   • Separating point between the rear muffler and the tailpipe, refer to TAIL PIPES, REPLACING 
   • Align the exhaust system free of tension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
5. Seal
   • Replace
6. Nut
   • 23 Nm
7. Catalytic Converter
   • Protect from shocks and impact stress
   • Removing and installing:
     • Vehicles with automatic transmission 0B6, refer to LEFT CATALYTIC CONVERTER, REMOVING AND INSTALLING, WITH AUTOMATIC TRANSMISSION 0B6  and RIGHT CATALYTIC CONVERTER, REMOVING AND INSTALLING, WITH AUTOMATIC TRANSMISSION 0B6 .
   • Individual components of suspension, refer to Fig 4
8. Nut
   • 23 Nm
9. Seal
   • Replace
10. Front Muffler
    • With decoupling element, decoupling element must not be bent more than 10° - otherwise it may be damaged
    • Removing and installing, refer to FRONT MUFFLER, REMOVING AND INSTALLING .
    • Align the exhaust system free of tension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
11. Front Clamping Sleeve
    • Installed position, refer to Fig 2
    • Before tightening, align exhaust system free of tension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
    • Tighten threaded connections evenly.
12. Nut
    • 23 Nm
13. Bolt
    • 23 Nm
14. Clamp
15. Tail Pipe
    • Original equipment as one unit with rear muffler. For repairs, replace each separately
    • Separating point, refer to TAIL PIPES, REPLACING .
    • Aligning, refer to ALIGNING TAIL PIPE .
16. Suspended Mount
    • Replace if damaged.
    • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
17. Nut
    • 20 Nm
    • Replace
18. Rear Clamping Sleeve
    • For individual replacement of center and rear mufflers
    • Installed position, refer to Fig 2
    • Before tightening, align exhaust system free of tension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
    • Tighten threaded connections evenly.
19. Nut
    • 23 Nm
20. Nut
    • 23 Nm
    • Replace
21. Bolt
    • 23 Nm
22. Suspended Mount
    • Replace if damaged.
    • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .

Fig 2: Adjusting Front Double Clamps So Bolt Ends Do Not Project Over Lower Edges Of Double Clamps

Courtesy of AUDI OF AMERICA, LLC

-- Install double clamps so that the bolt ends do not project over lower edge of double clamp.

• Installed position: the threaded connectors face outward.

Fig 3: Identifying Installed Position Of Rear Double Clamps

Courtesy of AUDI OF AMERICA, LLC

-- Install double clamps so that the bolt ends do not project over lower edge of double clamp.

• Installed position: the threaded connectors face forward.

Fig 4: Catalytic Converter Mounting Components

Courtesy of AUDI OF AMERICA, LLC

1. Nut - 23 Nm
2. Spacer Sleeve
3. Pressure Spring
4. Washer
5. Bolt
6. Bolt - 23 Nm
7. Spacer Sleeve
8. Adjusting Buffer
9. Tab
10. Bolt - 23 Nm
11. Bracket