Bull-X 3″ downpipe, Audi A4/A5 B8 2.0 TFSI (ECE)

Bull-X 3″ downpipe, Audi A4/A5 B8 2.0 TFSI (ECE)

A downpipe is one of the most popular upgrades for a turbocharged engine. Efficient exhaust flow is important for a turbo system, and a freer-flowing pipe can provide a sportier sound while improving throttle response and power potential. Read more about the different downpipe types in our Futurez guide.

This Bull-X downpipe is also available with an HJS catalytic converter and model-specific ECE approval. The ECE version is intended for legal road use on the vehicle applications covered by the approval.

Bull-X 3″ downpipe, Audi A4/A5 B8 2.0 TFSI is a vehicle-specific stainless-steel assembly for Audi A4 B8/8K and A5 B8/8T 2.0 TFSI models. Its 76 mm / 3″ pipe size and freer-flowing design reduce exhaust back pressure and allow the turbocharger to operate with less restriction, particularly on tuned engines.

Lower back pressure can improve turbo response and throttle response while reducing thermal load on the exhaust side. The vehicle-specific design replaces the original component without unnecessary fabrication.

• Pipe diameter 76 mm / 3″
• Manufactured from stainless steel
• Vehicle-specific plug-and-play design
• Freer-flowing construction reduces exhaust back pressure
• Helps reduce thermal load on the turbo and exhaust side
• Connects to the original exhaust system
• Made in Germany
• Key fitment detail: CDNB, CDNC and CNCD engine codes

Catalytic-converter options

• With a 100-cell sports catalytic converter
• With a 200-cell sports catalytic converter
• With a Bull-X EOBD 200-cell sports catalytic converter
• With a catalytic-converter replacement pipe
• With an HJS 200-cell sports catalytic converter and ECE approval
• Without a catalytic converter

Versions without a catalytic converter or with a regular 100- or 200-cell sports catalyst do not include model-specific ECE approval. They are intended for motorsport and other off-road enthusiast use. Do not use an unapproved version on public roads, and always check the current road regulations.

Unapproved catalytic-converter options or a catalyst-delete version may trigger a fault code related to the downstream oxygen sensor. Any required software changes depend on the vehicle ECU and selected version.

Examples of compatible vehicles

• Audi A4 B8/8K 2.0 TFSI, front-wheel drive and quattro
• Audi A5 B8/8T 2.0 TFSI, front-wheel drive and quattro

Before ordering, verify the vehicle engine and body version, engine code and the exact vehicle coverage of the selected catalytic-converter approval.