BMW M3/M4 Cat Delete Downpipes
These lightweight ?test pipes? fit in place of the heavy OEM catalytic converters integrated into the downpipe. Using a test pipes removes the flow restriction a catalytic converter places on an exhaust system, while increasing the horsepower.
The silencing effect of the converters are also removed, enhancing the aggressive engine sound. Test pipes are ideal for track days and race application.
Lambda or Oxygen Sensor Bungs are pre-installed and threaded.
Made from T309 (1.4828) stainless steel.
*Recommended For Off-Road and Track Use Only*
Test pipes may trigger a CEL (Check Engine Light).
To disable the CEL you will need to mod/tune the ECU.