Bull-X Downpipes Audi RS4/RS5 B9 quattro 450 hp

Bull-X Downpipes Audi RS4/RS5 B9 quattro 450 hp

A downpipe is one of the most popular turbo-engine upgrades. A freer-flowing exhaust side can add a sportier sound while supporting throttle response and power potential. Read more in the Futurez downpipe guide.

This product does not have model-specific ECE approval. It is intended for motorsport and other off-road enthusiast use.

Bull-X Downpipes Audi RS4/RS5 B9 quattro 450 hp offers vehicle-specific bolt-on fitment in place of the original downpipe. Its larger diameter and freer-flowing shape reduce back pressure after the turbocharger. This can sharpen turbo response and reduce exhaust-side thermal load, particularly on tuned engines.

• Pipe size 101mm / 121mm
• Vehicle-specific construction
• Freer-flowing design reduces exhaust back pressure
• Helps reduce thermal load on the turbocharger and exhaust side
• Manufactured from stainless steel
• TIG-welded construction
• Made in Germany

Catalytic-converter options

• 100-cell sports catalyst
• 200-cell sports catalyst
• HJS 200-cell EOBD
• HJS 200-cell Euro 6
• Without catalytic converter

An unapproved catalyst version or catalyst-delete pipe is intended for motorsport and off-road enthusiast use. Do not use an unapproved version on public roads, and always check the current road regulations. On some models, a freer-flowing catalyst may trigger a warning light because the ECU monitors exhaust flow. In these cases, the ECU settings may need adjustment or the downstream oxygen sensor may require a suitable adapter.

Examples of compatible vehicles

• Audi RS4/RS5 B9 quattro 450 hp (2017–2025)

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