Bull-X Downpipe Audi A4 B7 2.0 TFSI

This Bull-X ECE downpipe can be exchanged 1:1 against the OEM downpipe and it provides a higher exhaust passage and a lower exhaust back pressure, increases power, reduces the exhaust gas temperature and relieves the turbocharger.
This is additionally supported by the increased pipe diameter of 76mm (up to the transition flange).

The original part is reduced to 55mm immediately after the catalyst outlet, causing additional exhaust backpressure.

Ideal also for performance-enhanced vehicles. In addition, after the installation of this downpipe a soundplus (sound change) is recorded. Especially in combination with a sports exhaust system.

Details:
- pipe diameter: 76mm/3" (at the transition flange to the exhaust system reduced to 63,5mm, in order to maintain the original connection to the exhaust system can)
- Material: stainless steel
- completely TIG welded

Catalyst information

When selecting a downpipe without a catalytic converter or with a 100/200-cell catalytic converter, there may be an error message of the post-catalytic lambda sensor in the control unit, which does not lead to restrictions in driving operation because the first lambda sensor end is present for the motor control. The post-cat Sensor is only responsible for monitoring the effect of the catalyst. This can be programmed out by adapting the software from a chip tuner.

With most cars up to Euro 3 Emission code, there is no post-cat Sensor and installation is possible without further adjustment and error message.

The wash coat content of HJS ECE and EOBD Kats is significantly higher and is characterized by a very high oxygen storage capacity, which means that errors can be avoided. The EOBD Kats are tested for this topic up to Euro 4. The durability and the use up to the Euro 6 exhaust-gas standard is of course given.
For Euro 5/6 vehicles, the above points can only be avoided if a cat with an ECE selection is made.
For more information on pollutant classes, please click here.