Capristo Exhaust Downpipe Decat BMW M3/4 F80/82/83 2014-2020 02BM07403008

These lightweight "test pipes" fit in place of the heavy OEM catalytic converters integrated into the downpipe. Using test pipes removes the flow restriction that 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 tubes are ideal for track days and racing applications.

Oxygen or lambda probe plugs are pre-installed and threaded.

Made from T309 (1.4828) stainless steel.

IMPORTANT:

*Recommended for off-road and track use only*

The tubes may activate a CEL (Check Engine Light).

To disable the CEL, you will need to modify/tune the ECU.