General information (Audi A6 C5)

The exhaust system ensures the removal of exhaust gases into the atmosphere, a decrease in the concentration of pollutants, a reduction in engine noise to the required level with minimal loss of engine power. In order for the exhaust system to perform its functions, it must be in good condition. The condition of the exhaust system also affects engine power and fuel consumption.

The exhaust system consists of a turbocharger (only diesel TDI and petrol 150 hp engine.) exhaust manifold, catalytic converter, exhaust pipe and mufflers. All-wheel drive vehicles with V6 engines have two exhaust pipes and two catalytic converters. All other all-wheel drive vehicles have two rear mufflers.

The middle and rear mufflers are welded together and installed as one piece. Despite this, the mufflers can be replaced separately.

Exhaust pipes provide connections between the elements of the exhaust system.

Mufflers are designed to smooth out pulsations in the exhaust gas flow and reduce noise levels. Mufflers operate based on two physical effects - resonance and sound absorption. Mufflers usually use a combination of these effects.

Resonant mufflers consist of chambers of different lengths, connected to each other by pipes. The difference in the cross-sectional areas of the pipes and chambers, the change in the direction of the exhaust gas flow and the presence of resonators together with connecting pipes and chambers, ensures optimal noise reduction, especially at low frequencies.

The exhaust system is attached to the bottom of the car using elastic elements to reduce vibration from the passage of exhaust gases.

After working on the exhaust system, check that the system is installed freely, without tension, and that there is sufficient clearance from the body elements.

(The article is a reprint of material from «AUDImanual»)