What is a test pipe?

A test pipe, also known as a test pipe simulator or test pipe delete, is an automotive aftermarket component that is used to replace the catalytic converter in a vehicle's exhaust system.

The catalytic converter is an emissions control device that reduces the harmful pollutants in the exhaust gases produced by an internal combustion engine. However, it can also restrict the flow of exhaust gases, which can limit the engine's performance.

A test pipe is typically made of stainless steel and is designed to be a direct bolt-on replacement for the catalytic converter. It eliminates the restrictive nature of the catalytic converter and allows for increased exhaust flow.

By removing the catalytic converter and installing a test pipe, the exhaust gases can flow more freely, resulting in improved engine horsepower and torque. It can also lead to a louder and more aggressive exhaust sound.

However, it is important to note that using a test pipe is illegal in many regions as it bypasses emissions control regulations. The catalytic converter plays a crucial role in reducing harmful emissions, and removing it can contribute to increased pollution.

Before installing a test pipe, it is advisable to check local laws and regulations to ensure compliance. Some jurisdictions strictly enforce emissions regulations and can impose fines or penalties for using test pipes.