Audi Audi A3 2004-2013 Exhaust Specifications

The exhaust pipe diameter for the 2004-2013 Audi A3 varies by engine type. For the 2.0T FSI engine, the diameter is 60mm, while the 1.8T engine uses a 55mm diameter. Always verify the specific engine configuration before ordering parts.

The 2004-2013 Audi A3 is equipped with a three-way catalytic converter (TWC) that complies with Euro 4 and Euro 5 emission standards. The converter is made of stainless steel and has a honeycomb structure coated with platinum, palladium, and rhodium for optimal emissions control.

Audi recommends inspecting the exhaust system every 30,000 miles or 24 months, whichever comes first. Look for signs of corrosion, leaks, or damage to the muffler, catalytic converter, and exhaust pipes. Regular inspections help prevent costly repairs and ensure compliance with emissions regulations.

While aftermarket exhaust systems are available, Audi strongly recommends using genuine OEM parts to ensure compatibility, performance, and compliance with emissions standards. Non-genuine parts may void the vehicle's warranty and could lead to improper fitment or reduced performance.

The torque specification for exhaust manifold bolts on the 2004-2013 Audi A3 is 25 Nm (18.4 lb-ft) for the 2.0T FSI engine and 20 Nm (14.8 lb-ft) for the 1.8T engine. Always use a calibrated torque wrench and follow the manufacturer's tightening sequence to avoid damage.

To replace the muffler, first, secure the vehicle on a lift or jack stands. Remove the heat shields and disconnect the exhaust clamps. Support the exhaust system to prevent strain on other components. Install the new muffler using new gaskets and clamps, and torque the clamps to 40 Nm (29.5 lb-ft). Ensure proper alignment to avoid leaks.