Capristo decatalyst downpipe BMW M3/M4 G80/G82 from 2021 02BM07403022

These lightweight test pipes fit in place of heavy OEM catalytic converters. Using test pipes removes the flow restriction a catalytic converter places on an exhaust system, while also increasing horsepower.

The muffling effect of the converters is also eliminated, enhancing the aggressive engine sound. Test pipes are ideal for track days and racing applications.

On applicable models, the center section is made flexible as an added protection feature against vibration damage to the header pipes and Lambda or Oxygen. Sensor caps are pre-installed and threaded.

Made of T309 (1.4828) stainless steel.

IMPORTANT:

*Designed and recommended for off-road and track use only*

Modifying the OEM catalytic converter may activate a CEL (Check Engine Light).

To disable a recurring CEL, ECU tuning will be required.