Audi Audi A6 2004-2011 Exhaust Specifications

The exhaust pipes on the 2004-2011 Audi A6 typically have an outer diameter of 60mm for the 2.0T FSI and 3.0L V6 models, while the 4.2L V8 models feature a 70mm outer diameter. These measurements may vary slightly depending on the specific trim and engine configuration.

The 2004-2011 Audi A6 is equipped with a three-way catalytic converter (TWC) that complies with Euro 4 emissions standards. The catalytic converter is integrated into the exhaust manifold for the 2.0T FSI engine, while the 3.0L V6 and 4.2L V8 models feature a separate catalytic converter downstream of the exhaust manifold.

Audi recommends inspecting the exhaust system every 15,000 miles or 12 months, whichever comes first. This includes checking for leaks, corrosion, and damage to the catalytic converter, muffler, and exhaust pipes. Regular inspections are critical to maintaining optimal performance and emissions compliance.

Yes, but it is important to ensure the aftermarket system meets Audi's specifications and emissions standards. Using non-genuine parts may void the vehicle's warranty and could result in non-compliance with local emissions regulations. Always consult with a certified Audi technician before making modifications.

The torque specification for the exhaust manifold bolts on the 2004-2011 Audi A6 is 20 Nm (15 lb-ft) for the 2.0T FSI engine, 25 Nm (18 lb-ft) for the 3.0L V6, and 30 Nm (22 lb-ft) for the 4.2L V8. Always use a torque wrench and follow the manufacturer's tightening sequence to avoid damage.

The oxygen sensors (O2 sensors) monitor the air-fuel ratio in the exhaust gases and provide feedback to the engine control unit (ECU). The 2004-2011 Audi A6 typically has two upstream sensors (pre-catalytic converter) and two downstream sensors (post-catalytic converter) to ensure optimal combustion efficiency and emissions control.