Overview - Muffler

Fig 1: Muffler System Overview

Courtesy of AUDI OF AMERICA, LLC

1. Rear Muffler
   • Original equipment as one unit with center muffler. For repairs, replace each separately
   • Removing and installing, refer to MUFFLER, REMOVING AND INSTALLING .
   • Separating point, refer to EXHAUST PIPES/MUFFLERS, SEPARATING .
   • Align the exhaust system free of tension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
2. Suspended Mount
   • Replace if damaged.
   • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
3. Bolt
   • 20 Nm
4. Center Muffler
   • Original equipment as one unit with rear mufflers. For repairs, replace each separately
   • Removing and installing, refer to MUFFLER, REMOVING AND INSTALLING .
   • Separating point, refer to EXHAUST PIPES/MUFFLERS, SEPARATING .
   • Align the exhaust system free of tension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
5. Nut
   • 23 Nm
   • Replacing
   • Coat the threads with hot bolt paste; for the correct hot bolt paste .
6. Seal
   • Replacing
7. Catalytic Converter
   • Protect from shocks and impact stress
   • Removing and installing, refer to CATALYTIC CONVERTER, REMOVING AND INSTALLING .
   • Individual components of suspension, refer to Fig 4
8. Seal
   • Replacing
9. Nut
   • 23 Nm
   • Replacing
   • Coat the threads with hot bolt paste; for the correct hot bolt paste .
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
    • Pushed all the way onto the front muffler
    • Before tightening, align exhaust system free of tension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
    • Tighten threaded connections evenly.
12. Nut
    • 23 Nm
13. Trim Panel
    • For tail pipe
    • only Audi S6/S7
    • Push all the way onto the tail pipes
14. Suspended Mount
    • Replace if damaged.
    • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
15. Bolt
    • 23 Nm
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. Bolt
    • 23 Nm
19. 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: Threaded connections point toward outside.
• Angle -α- = 45°.

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: Threaded connections point 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: Exhaust Door Control Unit

Courtesy of AUDI OF AMERICA, LLC

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