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What Is a Back Box Delete Exhaust & Should You Install It? (Muffler Delete Explained)

Updated: Jan 25

A back box delete is an exhaust modification that removes the back box (rear muffler / silencer) and replaces it with a typically unmuffled exhaust pipe. It's usually done to increase the loudness or improve the tone of the exhaust sound without changing the whole exhaust system.

The back box delete is also known as a muffler delete.

The rear muffler of an exhaust is not essential for the vehicle to function, it does not affect emissions and only changes the sound of the exhaust.

It typically looks like a metal box or cylinder at the rear of the vehicle. A muffler is filled with sound absorbing material like fibreglass, it also can be baffled and contain sound resonating chambers.

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