Milltek C63 W204 Secondary Catalyst Bypass

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The Milltek secondary cat bypass for the Mercedes-Benz C63 AMG W204 is an aftermarket exhaust modification designed to replace or eliminate the secondary catalytic converters in the vehicle's exhaust system. Here are some potential effects and benefits of installing a Milltek secondary cat bypass:

Improved Exhaust Flow: The primary purpose of a secondary cat bypass is to enhance exhaust flow by eliminating or replacing the secondary catalytic converters. This can reduce back pressure in the exhaust system, potentially leading to improved engine performance. However, the actual impact on performance may vary, and other factors, such as the overall exhaust system design and engine tuning, also play a role.

Increased Sound: One of the noticeable effects of removing or replacing catalytic converters is an increase in exhaust sound. The secondary cat bypass may contribute to a louder and more aggressive exhaust note, providing a sportier and more distinctive sound.

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