Muffler Overview

Fig 1: Identifying Muffler Overview

Courtesy of AUDI OF AMERICA, LLC

1. Retaining Loop
   • Replace if damaged
2. Center Muffler
   • Unit with rear muffler
   • Install exhaust system free of stress, refer to EXHAUST SYSTEM, INSTALLING 
3. Nut
   • 20 Nm
4. Retaining Loop
   • Replace if damaged
5. Bracket for Exhaust System
6. Bolt
   • 25 Nm
7. Bracket for Exhaust System
8. Bolt
   • 23 Nm
9. Suspended Mount
10. Bolt
    • 23 Nm
11. Transverse Beam
12. Bolt
    • 23 Nm
13. Clip
    • 7 Nm
14. Bracket
15. Oxygen Sensor (O2S) after Three Way Catalytic Converter (TWC) -G130- with Heater for Oxygen Sensor (O2S) 1 after Catalytic Converter -Z29-
    • Removing and installing, refer to Removal and Installation
16. Primary Catalytic Converter
    • With decoupling element, decoupling element must not be bent more than 10° - otherwise it may be damaged
    • Do not load decoupling element on cable
    • Do not damage wire mesh at decoupling element
    • Protect primary catalytic converter from shocks and impact stress
    • Removing and installing, refer to PRIMARY CATALYTIC CONVERTER 
    • Remove decoupling element guard on replacement part as late as possible
    • Install exhaust system free of stress EXHAUST SYSTEM, INSTALLING 
17. Nut
    • Replace
    • Coat the threaded pin with hot bolt paste; hot bolt paste.
    • 23 Nm
18. Seals
    • Replace
19. Left Catalytic Converter
    • Removing and installing, refer to CATALYTIC CONVERTERS 
    • Install exhaust system free of stress EXHAUST SYSTEM, INSTALLING 
20. Clamping Sleeve
    • Before tightening, align exhaust system tension-free EXHAUST SYSTEM, INSTALLING 
    • Installed position Fig 2
    • Tighten threaded connections evenly.
21. Nuts
    • Tighten threaded connections evenly.
    • 23 Nm
22. Right Catalytic Converter
    • Removing and installing, refer to CATALYTIC CONVERTERS 
    • Install exhaust system free of stress EXHAUST SYSTEM, INSTALLING 
23. Retaining Loop
    • Replace if damaged
24. Bracket
25. Exhaust Flap Valve -N220-
    • with vacuum reservoir
    • Check the exhaust flap vacuum diaphragm EXHAUST FLAP VACUUM DIAPHRAGM, CHECKING 
26. Nut
    • 20 Nm
27. Bolt
    • 20 Nm

Fig 2: Identifying Installed Position Of Front Clamping Sleeves

Courtesy of AUDI OF AMERICA, LLC

-- Install clamping sleeves so that the bolt ends do not project over lower edge of clamping sleeves.

• The threaded connections are toward the right.