Muffler Overview

Catalytic Converters and Particulate Filter

Fig 1: Exhaust Pipe With Catalytic Converter, Particulate Filter, And Reduction Catalytic Converter Overview

Courtesy of AUDI OF AMERICA, LLC

1. Bolt
   • 23 Nm
2. Suspended Mount
   • Replace if damaged
   • Check pretension, refer to EXHAUST SYSTEM, INSTALLING 
3. SCR - Catalytic Converter
   • Removing and installing, refer to SCR CATALYTIC CONVERTER 
4. Clamp
5. Gasket
   • Replace
6. Reducing Agent Injector -N474-
   • Removing and installing, refer to Reducing Agent Injector -N474- 
7. Bolt
   • Tightening specifications  List Item:Bolt
8. Gasket
   • Replace
9. Gasket
   • Replace
10. Bolt
    • 23 Nm
11. Bracket
    • For the preliminary catalytic converter
12. Nut
    • Replace
    • 23 Nm
    • Coat with hot bolt paste.
13. Gasket
    • Replace
14. Turbocharger
15. Primary Catalytic Converter
    • With flex joint
    • Do not bend the decoupling element more than 10° or it will be damaged.
    • Protect from shocks and impact stress
    • Removing and installing, refer to PRIMARY CATALYTIC CONVERTER 
    • Install exhaust system free of stress, refer to EXHAUST SYSTEM, INSTALLING 
16. Bolt
    • 23 Nm
17. Nut
    • Replace
    • 23 Nm
    • Coat with hot bolt paste.
18. Particulate Filter
    • With catalytic converter
    • With the exhaust pressure sensor 1 -G450- pressure line. Refer to list item  15
    • Removing and installing, refer to PARTICULATE FILTER 
19. Suspended Mount
    • Replace if damaged
20. Bolt
    • 23 Nm
21. Suspended Mount
    • Replace if damaged
22. Bolt
    • 23 Nm
23. Nut
    • Replace
    • 23 Nm
    • Coat with hot bolt paste.
24. Suspended Mount
    • Replace if damaged
25. Bolt
    • 23 Nm
26. Nut
    • 23 Nm
27. Clamping Sleeve
    • Before tightening, align exhaust system tension-free, refer to EXHAUST SYSTEM, INSTALLING 
    • Installed location, refer to Fig 3
    • Tighten threaded connections evenly.

Rear Muffler and Tail Pipes 

Fig 2: Rear Muffler And Tail Pipes

Courtesy of AUDI OF AMERICA, LLC

1. Exhaust Tailpipe
   • Removing and installing, refer to TAILPIPES 
2. Bolt
   • 60 Nm
3. Suspended Mount
   • Replace if damaged
4. Bolt
   • 23 Nm
5. Rear Muffler
   • Different versions for emissions standard EU 6 and BIN 5.
   • Install exhaust system free of stress EXHAUST SYSTEM, INSTALLING 
6. Bolt
   • 23 Nm
7. Suspended Mount
   • Replace if damaged
8. Suspended Mount
   • Replace if damaged
9. Bolt
   • 23 Nm
10. Exhaust Tailpipe
    • Removing and installing, refer to TAILPIPES 
11. Bolt
    • 60 Nm

Fig 3: Clamping Sleeve Location

Courtesy of AUDI OF AMERICA, LLC

• Lower threaded connections