Removing and installing centre silencer and rear silencer — AUDI
Removing and installing centre silencer and rear silencer on Audi: factory workshop procedure for engines AZC, BHT, BSB, BTE.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📋 Procedure
ℹ️ Torque figures below come verbatim from workshop data — always cross-check against your vehicle's factory manual before final tightening.
Audi
Audi A8
1994
Power unit
12-cylinder engine, mechanics
Edition
12.2004
Removing and installing centre silencer and rear silencer
40 Nm
Clamp (front right)
Align exhaust system so it is free of stress before tightening clamp
Chapter
Installation position of bolts
Fig.
Tighten bolt connections evenly; at the same time push exhaust pipes of centre silencer upwards slightly
40 Nm
Clamp (front left)
Align exhaust system so it is free of stress before tightening clamp
Chapter
Installation position of bolts
Fig.
Tighten bolt connections evenly; at the same time push exhaust pipes of centre silencer upwards slightly
Rubber mounting
Black with coloured marking
Check preloading, refer to "Stress-free alignment of exhaust system"
Chapter
Bracket
25 Nm
Centre silencer
Align exhaust system so it is free of stress
Chapter
Clamp (rear left)
Align exhaust system so it is free of stress before tightening clamp
Chapter
Installation position
Fig.
Tighten bolt connections evenly; at the same time turn rear silencer clockwise slightly until the tailpipes are horizontal
Clamp (rear right)
Align exhaust system so it is free of stress before tightening clamp
Chapter
Installation position
Fig.
Tighten bolt connections evenly; at the same time turn rear silencer clockwise slightly until the tailpipes are horizontal
40 Nm
40 Nm
25 Nm
Bracket
Rubber mounting
Black with coloured marking
Check preloading, refer to "Stress-free alignment of exhaust system"
Chapter
Fastener
With retainer
Bracket
Nut and washer assembly, 28 Nm
Only fit with ∅ 32 mm washer
Rubber mounting
Red
Check preloading, refer to "Stress-free alignment of exhaust system"
Chapter
Vacuum hose
For exhaust flap
From
exhaust flap valve
N321
Bracket
25 Nm
Rubber mounting
Red
Check preloading, refer to "Stress-free alignment of exhaust system"
Chapter
Rear silencer
With exhaust flap
Checking exhaust flap
Chapter
Align exhaust system so it is free of stress
Chapter
Installation position of front clamps
Install clamps so that the bolt ends do not protrude beyond bottom of clamp.
Bolt connections face one another.
Installation position of rear clamps
Install clamps so that the bolt ends do not protrude beyond bottom of clamp.
Bolt connections face outwards.
Distance of exhaust pipes from cross member for underbody
1
Cross member for underbody
Dimension
a
= dimension
d
Dimension
b
= approx. 24 mm
Dimension
c
= approx. 24 mm
Dimension
d
= dimension
a
Distance of main catalytic converters to propshaft heat shield and to underbody
1
Heat shield for propshaft
Dimension
a
= approx. 20 mm
Dimension
b
= approx. 22 mm
Dimension
c
= approx. 17 mm
Dimension
d
= approx. 28 mm
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.