Bull-X Downpipes Audi RS4/RS5 B9 quattro 450 hp + OPF | 200-cell EOBD catalytic converter (HGDPVAG006F-3)

These Bull-X downpipes can be swapped 1:1 for the standard Y-pipes. The available catalytic converters offer a higher exhaust flow and a lower exhaust back pressure, which results in extra power, lowers the exhaust gas temperature and relieves the turbochargers.
This is further supported by the enlarged pipe diameter of 121-101mm and the elimination of the second catalytic converter.

The downpipes run from the original turbo flange at 121mm, then continue at 101mm and are only reduced to 76mm directly at the original flange.

Also ideal for vehicles with increased power output.
In addition, a sound enhancement (change in sound) can be noticed after fitting these downpipes. Especially in combination with a sports exhaust system.

- OEM downpipes each have 2 catalytic converters fitted, the Bull-X downpipes are fitted with a maximum of one catalytic converter
- incl. integral insulation
- Material: stainless steel
- Fully TIG welded
- clearly audible sound enhancement (also with OEM exhaust system)
- when selecting the catalytic converter variant "with HJS 200 cell Euro6 catalytic converter", no software adjustment is necessary / no error message from the catalytic converter monitoring appears (only on models WITHOUT OPF)

Note for models with OPF:
A software adjustment is necessary when installing the downpipes.
Both the temperature sensors and the differential pressure sensors must be programmed out.

Pre-facelift:The downpipes are supplied without connections for the sensors to avoid unnecessary costs.

TÜV / ABE available upon request

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