bonnet AUDI A8 2003 D3 / 2.G Technical Features Manual

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Thin-walled ceramic monoliths are used to
improve cold starting behaviour.
On environmental grounds, the centre
silencer is fitted with long-fibre glass wool
instead of basalt wool.
A connecting pipe is located directly
upstream of the centre silencer.
This forms the joint between the two exhaust
pipes required for acoustic reasons.
With the 4.2 l and 3.7 l engines, the exhaust
system is of the dual-flow type.
It consists of two underbonnet catalytic
converters, two flexible decoupling elements,
two reflection-type front silencers, an
absorption-type centre silencer and two
reflection-type rear silencers with visible tail
pipes. The catalytic converters are of the two-
stage type and fitted with a ceramic monolith.
SSP282_028
Exhaust system
Two-stage catalytic
converter
Lambda probe G39,
cylinder bank 1
Lambda probe
after catalyst G130
Lambda probe II G108,
cylinder bank 2 Lambda probe II
after catalyst G131 Exhaust manifold
Connecting pipe