Muffler Overview

Fig 1: Identifying Muffler Overview

Courtesy of AUDI OF AMERICA, LLC

1. Center Muffler
   • Original equipment as one unit with rear mufflers. For repairs, replace each separately
   • Separating point, refer to EXHAUST PIPES/MUFFLERS, SEPARATING 
   • Align the exhaust system free of tension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION 
2. Rear Muffler
   • Original equipment as one unit with center muffler and tailpipe
   • The center muffler and the rear muffler can be replaced individually if a repair is required.
   • Separating point between the center and rear muffler, refer to EXHAUST PIPES/MUFFLERS, SEPARATING 
   • Align the exhaust system free of tension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION 
3. Seal
   • Replace
4. Nut
   • 20 Nm
   • Replace
   • Coat the threads with hot bolt paste .
5. Catalytic Converter
   • Protect from shocks and impact stress
   • Removing and Installing: left, refer to LEFT CATALYTIC CONVERTER, REMOVING AND INSTALLING , right refer to RIGHT CATALYTIC CONVERTER, REMOVING AND INSTALLING 
6. Nut
   • 20 Nm
   • Replace
7. Seal
   • Replace
8. 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 .
9. Suspended Mount
   • Replace if damaged
   • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION 
10. Bolt
    • 23 Nm
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. Hood
    • For the tail pipe
    • Push all the way onto the tail pipe
14. Suspended Mount
    • Replace if damaged
    • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION 
15. Nut
    • 23 Nm
16. 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.
17. Nut
    • 23 Nm
18. Nut
    • 25 Nm
19. Suspended Mount
    • Replace if damaged
    • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION 
20. Bolt
    • 23 Nm
21. Suspended Mount
    • Replace if damaged
    • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION 

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

• Installed position: the threaded connectors face outward.
• Angle -α- = 45°.

Fig 2: Installed Position of Front 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 3: Installed Position Of Rear Double Clamps

Courtesy of AUDI OF AMERICA, LLC