Overview - Muffler

Fig 1: Overview Of Muffler

Courtesy of AUDI OF AMERICA, LLC

1. Bolt
   • Tightening specification: 23 Nm
2. Suspended Mount
   • Replace if damaged.
   • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
3. Center Muffler
   • Removing and installing with the rear muffler, refer to MUFFLER, REMOVING AND INSTALLING .
   • 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 .
4. Seal
   • Replace
5. Nut
   • Tightening specification: 23 Nm
6. 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 
   • Individual components of suspension, refer to Fig 4
7. Nut
   • Tightening specification: 23 Nm
8. Seal
   • Replace
9. 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 .
10. 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.
11. Nut
    • Tightening specification: 23 Nm
12. Suspended Mount
    • Replace if damaged.
    • Check pretension, refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
13. Bolt
    • Tightening specification: 23 Nm
14. Rear Muffler
    • Removing and installing with center muffler, refer to MUFFLER, REMOVING AND INSTALLING .
    • Original equipment as one unit with center muffler
    • 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 .
15. 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.
16. Nut
    • Tightening specification: 23 Nm
17. Nut
    • Tightening specification: 20 Nm
    • Replace
18. Bolt
    • Tightening specification: 23 Nm
19. 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

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-- 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

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

Fig 5: Removing/Installing Exhaust Door Control Unit

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the nuts -3- to 3 Nm.