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When it comes to upgrading the downpipes on a Mercedes-AMG GT63, there are several high-quality aftermarket options available that are favored by enthusiasts for their performance gains, sound enhancement, and build quality. Here are some of the best downpipes for the AMG GT63:

Key Features: Brondex Performance is known for producing high-quality components for performance cars. Their Brondex downpipes are made from stainless steel, offering significant reductions in backpressure. These downpipes are designed to work seamlessly with the GT63’s twin-turbo V8, improving both power and throttle response.

Sound: These downpipes enhance the exhaust note, providing a deeper, more aggressive tone.

Compatibility: Designed to work with the stock exhaust system or aftermarket exhausts.

Key Features: Weistec is renowned for their expertise in Mercedes-AMG tuning. Their downpipes for the GT63 are made from T304 stainless steel and are precision-engineered for a perfect fit. These downpipes are available in both catted and catless versions, depending on your preference for emissions compliance and sound.

Sound: The catless version, in particular, offers a much more aggressive exhaust sound, while the catted version provides a good balance between performance and emissions.

Performance: Significant gains in horsepower and torque, especially when paired with a Weistec ECU tune.

Key Features: FI Exhaust is well-known for their high-quality exhaust systems. Their downpipes for the AMG GT63 are designed to maximize exhaust flow and minimize backpressure. These downpipes are handcrafted and made from T304 stainless steel.

Sound: FI Exhaust downpipes are designed to enhance the AMG’s signature sound, giving it a more pronounced, aggressive tone without excessive drone.

Flexibility: These downpipes are compatible with both the stock exhaust system and FI's own valvetronic exhaust systems.

Key Features: Akrapovič is a premium exhaust manufacturer, known for their titanium systems. Their downpipes for the AMG GT63 are crafted with performance in mind, offering substantial weight savings and improved exhaust flow.

Sound: Akrapovič downpipes provide a distinctive, race-inspired exhaust note, which is both louder and more refined than stock.

Build Quality: Exceptional build quality with a focus on reducing weight while increasing performance.

Key Features: Fabspeed is another respected name in the aftermarket performance world. Their downpipes for the AMG GT63 are built from high-quality materials and are engineered to optimize exhaust flow for better performance.

Sound: Fabspeed downpipes offer a louder, more aggressive exhaust sound while still being refined.

Options: Available in both catted and catless versions, depending on your preference and local emissions regulations.

Considerations Before Purchasing:

Emissions: Some downpipes, especially catless versions, may not be street-legal in all areas due to emissions regulations. Make sure to check local laws before purchasing.

Warranty: Installing aftermarket downpipes may void certain aspects of your vehicle’s warranty, so it’s worth checking with your dealer or manufacturer.

Installation: Professional installation is recommended to ensure the best fit and performance.

Each of these options offers a significant improvement in both sound and performance, with slight differences in tone, power gains, and emissions compliance. Your choice will depend on your specific needs and preferences, such as whether you prioritize sound, emissions compliance, or maximum performance.