Give your N55-powered BMW more power with the addition of the Wagner Tuning downpipe. This downpipe is a direct bolt-on application allowing you to free up horsepower by reducing back pressure. Featuring stainless steel construction and a 200CPI catalytic converter, this downpipe will add more horsepower and torque to your BMW. 

Catalytic Converter Disclaimer

Error display in the DME is possible.

It is to be noted that Wagner Tuning catalytic converters are intended to be used on OEM vehicles to optimize performance. They are NOT intended to be used in conjunction with an ECU tune. Wagner Tuning Inc. assumes no responsibility for damages caused by modifications made to a vehicle, such as a tuned ECU and 'burble' style tunes. Wagner Tuning Inc. is also not responsible for damages caused by engine malfunctions creating rich/lean conditions detrimental to the catalyst. A warranty audit will be performed on any claim regarding a catalytic converter. For a warranty to be honored, Wagner Tuning Inc. will require the purchaser to provide proof that the engine was unaltered, tuned to the original manufacturer's specifications, and maintained properly. The end user assumes all responsibility regarding the legality of the use of a non-OEM catalytic converter on their vehicle for the region in which it is used.