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What Is a Decat Exhaust? (Explained)

Updated: Jan 25

A de-cat exhaust is an exhaust system which has had the catalytic converter removed, hence the name "decat". Its often done to improve power output, increase exhaust sound and improve exhaust tone.

When a car is decatted, the catalytic converter is removed and replaced with a hollow metal pipe, generally the same size as the exhaust its connecting to. Other exhaust systems such as a straight pipe are also decatted.

Most modern vehicles, particularly in Europe, are equipped from the factory with one or more catalytic converters, their job is to reduce harmful emissions.

However, a catalytic converter is a restriction and can reduce exhaust gas flow and increase back pressure, therefore removing the catalytic converter will lessen restriction allowing for more power.

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a decat exhaust section