For enthusiasts looking to refine the sound and presence of their Mercedes-AMG G63, Milltek Sport offers a precision-engineered solution. The Milltek Valved Catback Exhaust System with Carbon Tips for W463 G63 (Non-GPF/OPF) and the Milltek Valved Catback Exhaust System with Carbon Tips for W463 G63 (GPF/OPF) transform the 4.0L twin-turbo V8 into a sharper, more aggressive performer while maintaining the durability and fitment expected from a factory-quality upgrade. Bulletproof Automotive is proud to offer both systems to AMG owners who demand premium exhaust engineering.
The G63 is one of the most distinctive SUVs on the road. With its squared-off styling, commanding stance, and powerful M177 twin-turbo V8, it delivers a unique mix of luxury and aggression. Yet, many owners find that the factory exhaust falls short of delivering the sound they expect from such a performance-focused vehicle. Stricter emissions and sound regulations in recent years have left stock systems quieter and more muted than ever, especially in GPF/OPF-equipped models.
This is where Milltek’s catback system makes its mark. By freeing up the exhaust flow while integrating valved technology, the system delivers a dual personality. At lower revs, it maintains a refined, comfortable tone suitable for city driving. With the valves open, it transforms the SUV into a full-blooded performance machine, producing a soundtrack that finally matches the power under the hood. G63 owners want an exhaust that captures the full personality of the engine, producing a deeper, more authentic V8 voice.
Each system is constructed from 304L aircraft-grade stainless steel, a material known for its ability to withstand heat cycles, resist corrosion, and maintain structural integrity. This ensures long-term reliability even under demanding conditions. On an SUV as heavy and capable as the G63, durability is crucial. Milltek’s engineers balance strength and performance by designing the system with precise pipe diameters and valved sections that optimize both tone and backpressure.
A standout detail is the use of quad carbon jet-90 tips, which not only modernize the look of the rear but also provide a sharper, motorsport-inspired aesthetic. These tips signal that the SUV is no longer stock; it has been tuned for enthusiasts who expect both performance and design refinement.
Milltek designed two dedicated systems for the W463 chassis, ensuring compatibility no matter the market version.
For non-GPF/OPF models, the kit includes rear sections, carbon jet-90 tips, and adaptors that allow for seamless installation across the rest of the world’s applications. This design lets owners of earlier models enjoy a performance upgrade without needing major modifications.
For GPF/OPF-equipped G63s, the system integrates directly without requiring adaptors. It reuses the OE valve motors and maintains full functionality of the factory electronic valve system. This ensures that owners retain control over exhaust modes while gaining a richer, more aggressive note that cuts through the limitations imposed by the factory setup.
Both systems showcase Milltek’s attention to detail in providing solutions that not only perform but also respect the nuances of global regulations and varying factory designs.
The AMG G63 is a statement vehicle; its sound should be as commanding as its look. With the Milltek system installed, the V8’s character comes alive. Acceleration is more visceral as the exhaust note builds with intensity, and downshifts are accompanied by sharp, aggressive tones that amplify the driving experience. On the highway, the valves can remain closed, offering comfort and refinement. Around town or on open roads, the system’s full soundtrack turns every throttle input into an event.
Owners who use their G63 for more than just city driving will also appreciate the balance between performance and comfort. The system avoids excessive drone, making long-distance trips just as enjoyable as spirited drives.
These catback systems are designed specifically for 2018–2024 Mercedes-AMG G63 (W463) models equipped with the M177 4.0L twin-turbo V8. They are direct replacements for the factory exhaust and require no permanent modifications. The precision fitment ensures that each installation feels like a factory-level upgrade rather than an aftermarket compromise.
One important note: non-GPF/OPF versions require an additional OE clamp and bolt from Mercedes for proper installation. Milltek highlights this to ensure customers get the right parts for a secure, leak-free fit.
The Milltek Valved Catback Exhaust System with Carbon Tips for the Mercedes-AMG G63 is available now through Bulletproof Automotive, offering both GPF/OPF and non-GPF/OPF versions to suit every model year and market. For AMG owners who refuse to compromise on performance, tone, or style, this is the upgrade that completes the G63 experience.
