Exhaust System: Description and Operation

Exhaust Systems, Emission Control

Exhaust System of Panamera S/4S

A special exhaust system made of long-life stainless steel is used for the new Panamera S and 4S. The front muffler contains an integrated branch coupling connection between the left and right exhaust branches; the rear mufflers on the right and left have twin-tailpipe covers (standard equipment).










Optional Sports Exhaust System

A sports exhaust system is offered additionally for all Panamera models. Like the standard exhaust system, the sports exhaust system up to the rear muffler consists of 2 primary catalytic converters and 2 main catalytic converters as well as a center muffler. The main muffler provides a rich and full sound typical of the V8 engines.







Both rear mufflers (E) with vacuum-controlled exhaust flaps (A) for an especially sporty sound. Electric switching valve (S) for vacuum control.







Similar to the exhaust system of the Panamera Turbo, there are two exhaust flaps in each case between the rear mufflers and the tailpipe covers which can be opened in order to achieve improved throughput. The tailpipe design is characterised by two striking twin tailpipes with titanium-colored trim elements that are additionally installed with distinctive twin-tailpipe covers made of stainless steel. An additional button for activating the sports exhaust system is integrated in the center console. The sound of the sports exhaust system is controlled taking into account the parameters of load, speed, engine speed and gear. This provides a richer sports car sound at the push of a button.

Exhaust Manifold and Catalytic Converters

To keep emissions low in the cold start phase in particular, it is important that the catalytic converter reaches its optimal operating temperature quickly. For this reason, the exhaust manifolds of all Panamera models are very short so that the high exhaust gas temperature can be used to heat the catalytic converters. This allows the highly-efficient pre- and main catalytic converters to heat up quickly and guarantee effective emission control.










The cylinder bank-specific LSU oxygen sensors ahead of the catalytic converter and LSF oxygen sensors behind the catalytic converter signal the exhaust gas composition to the DME control unit. The DME control unit can then use this information for targeted intervention in bank-specific mixture control. This ensures that the strictest emission standards are met - for the Panamera S and 4S: EU 5 in Europe and ULEV in the USA.







NOTE: The 3-way cascade catalytic converters on the left and right each contain a pre- and main catalytic converter.