Muffler Assembly Overview

WARNING: This page is about a different car, the 2009 Audi TT and 2008 Audi TT. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Heat shield lock washers can be loosened and tightened with a screwdriver. Tightening Specification: 2 Nm

Fig 1: Muffler Assembly Overview

Courtesy of AUDI OF AMERICA, LLC

Bolt
- 23 Nm
Bracket for Exhaust System
Center Muffler
- Unit with rear muffler
- Install exhaust system free of stress, refer to EXHAUST SYSTEM, INSTALLING
Retaining Loop
- Replace if damaged
Nut
- 23 Nm
Bracket for Exhaust System
Bolt
- 23 Nm
Suspended Mount
- Replace if damaged
Bolt
- 23 Nm
Tunnel Brace
Nut
- Replace
- 40 Nm
Seals
- Replace
Oxygen Sensors Before Catalytic Converter
- Threads on new oxygen sensors are coated with assembly paste
- When re-installing a used oxygen sensor, coat threads with hot bolt paste.
- Assembly paste or hot bolt paste must not get onto slots of sensor body.
- Removal and installation, refer to Removal and Installation
Oxygen Sensors Behind Catalytic Converter
- Threads on new oxygen sensors are coated with assembly paste
- When re-installing a used oxygen sensor, coat threads with hot bolt paste.
- Assembly paste or hot bolt paste must not get onto slots of sensor body.
- Removal and installation, refer to Removal and Installation
Front Exhaust Pipe with Catalytic Converters and Front Muffler
CAUTION:
Risk of damaging decoupling elements.
- Do not bend decoupling element in front exhaust pipe more than 10°.
- Do not load decoupling element on cable
- Do not damage wire mesh at decoupling element
- Protect catalytic converter from shocks and impact stress
- Removal and installation, refer to FRONT EXHAUST PIPE WITH CATALYTIC CONVERTERS AND FRONT MUFFLER
- Remove decoupling element guard on replacement part as late as possible
- Install exhaust system free of stress, refer to EXHAUST SYSTEM, INSTALLING
Nut
- 23 Nm
Clamping Sleeve
- Before tightening, ensure exhaust system is tension-free EXHAUST SYSTEM, INSTALLING
- Installed location, refer to Fig 2
- Tighten threaded connections evenly.
Rear Muffler
- Unit with center muffler
- Install exhaust system free of stress, refer to EXHAUST SYSTEM, INSTALLING
Retaining Loop
- Replace if damaged
Nut
- 23 Nm

Fig 2: Identifying Clamping Sleeve Position

Courtesy of AUDI OF AMERICA, LLC

-- Install clamping sleeve in angle position shown.

Threaded connections point toward the right.
Nuts face up.
α = approximately 20°