Large Bore Downpipe

The Milltek Sport SSXM453 is a large-bore downpipe engineered to enhance both performance and sound for your Mini Cooper S/JCW F55/F56 LCI models. Fabricated with a larger diameter than stock, this downpipe facilitates increased exhaust gas flow, leading to improved engine efficiency. When paired with a compatible catalyst bypass pipe, users can expect substantial power gains without the restriction typically imposed by a catalytic converter. Constructed from aerospace-grade type 304 non-magnetic stainless steel, the SSXM453 is built for longevity and resistance to discolouration. Milltek Sport utilizes mandrel bending to ensure consistent radius bends for optimized gas flow and carefully enlarges bore diameters to maximize performance without sacrificing mid-range torque. The exhaust systems undergo rigorous acoustic development to produce a sporty, crisp tone while avoiding NVH, drone, or cabin resonance. **Important Fitment and Usage Notes:** * **For Track Use Only:** This product is intended for off-road or motorsport applications. Its use may render your vehicle illegal for road use and prevent it from passing an MOT test. * **OE System Fitment:** Designed to fit with Original Equipment (OE) exhaust systems only. * **ECU Remap Required:** A Stage 2 ECU remap is mandatory for proper operation and performance. * **Vehicle Compatibility:** Specifically designed for Mini Cooper S/JCW F55/F56 LCI models equipped with a GPF/OPF (Gasoline Particulate Filter/Otto Particulate Filter), typically model years 2019-2023.