Overview - Muffler

Fig 1: Overview Of Muffler

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 tailpipes
   • 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. Nut
   • 23 Nm
   • Replacing
   • Coat the threads with hot bolt paste .
4. Seal
   • Replacing
5. Catalytic Converter
   • Protect from shocks and impact stress
   • Removing and installing, refer to CATALYTIC CONVERTER, REMOVING AND INSTALLING .
6. Seal
   • Replacing
7. Nut
   • 23 Nm
   • Replacing
   • Coat the threads with hot bolt paste .
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 .
   • Individual components of mounting:
     • Refer to Fig 4
     • Refer to Fig 5
   • Align the exhaust system free of tension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
9. 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.
10. Nut
    • 23 Nm
11. Bolt
    • 23 Nm
12. Suspended Mount
    • Replace if damaged.
    • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
13. Trim panel
    • for tail pipe
    • Installed depending on the model and version.
    • Push all the way onto the tail pipes
14. Bolt
    • 23 Nm
15. Suspended Mount
    • Replace if damaged.
    • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
16. Rear Clamping Sleeve
    • For individual replacement of center and rear mufflers
    • Installed position, refer to Fig 3
    • Before tightening, align exhaust system free of tension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
    • Tighten threaded connections evenly.
17. Nut
    • 23 Nm
18. Suspended Mount
    • Replace if damaged.
    • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
19. Bolt
    • 23 Nm
20. Suspended Mount
    • Replace if damaged.
    • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .

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 outward.
• Angle -α- = 45 degrees.

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: Individual Mounting Components

Courtesy of AUDI OF AMERICA, LLC

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

Fig 5: Right Suspended Mount Individual Components

Courtesy of AUDI OF AMERICA, LLC

1. Bolt - 23 Nm
2. Washer
3. Pressure Spring
4. Tab
5. Spacer Sleeve
6. Right Front Muffler
7. Spacer Sleeve
8. Adjusting Buffer
9. Spacer Sleeve
10. Bolt - 23 Nm

Fig 6: Exhaust Door Control Unit Tightening Specification

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the nut -2- to 3 Nm.