Axle-Back Exhaust System

The Milltek Sport SSXBM1173 is an axle-back exhaust system specifically engineered for the BMW G80 M3 and M3 Competition, and G82/G83 M4 models featuring the S58 3.0 Turbo engine. This system is compatible only with vehicles equipped with an OPF/GPF (Otto Particulate Filter/Gasoline Particulate Filter) and is designed for model years 2020 onwards. Constructed from aerospace-grade type 304, non-magnetic stainless steel, this exhaust system offers exceptional durability, resistance to corrosion, and longevity, even under harsh conditions. The 3.15-inch (80mm) diameter pipework is precisely mandrel-bent to ensure constant radius bends, optimising gas flow and enhancing performance without sacrificing mid-range torque. The system has undergone a comprehensive acoustic development process to achieve a sporty and crisp exhaust note that avoids unwanted NVH, drone, or cabin resonance. This particular system, SSXBM1173, is configured with JET-115 carbon fibre trims. Other tip finish options may be available, such as polished, Cerakote black, brushed titanium, and burnt titanium, though availability may vary. The system is ECE approved, indicating compliance with European standards. Installation of this axle-back system involves replacing the original rear silencer and associated pipework. A fitting kit is typically included, and documentation for installation is available. While not explicitly stated as requiring a tune, performance exhaust systems can sometimes benefit from ECU adjustments for optimal results.