Black Mamba BMW X3M / X4M F9x Decat Downpipes

The Black Mamba decat downpipes, made from high-quality T304 stainless steel, are designed for the BMW X3M and X4M F9x with S58 engines. These 3.15" (80mm) diameter downpipes remove the main catalysts and provide an impressive 35hp gain on a stage 1 engine, all while delivering a powerful and aggressive exhaust tone. Featuring a high-flow structure and thermal insulation that reduces heat radiation by 50%, these downpipes offer the best performance and value for your money. Direct bolt-on installation 2-piece kit 100% T304 stainless steel construction 3.15" (80mm) diameter pipes Thermal insulation to reduce heat radiation by 50% Measured gain of 35hp on a stage 1 engine Aggressive exhaust sound Handmade TIG welds for maximum durability Assembly kit included Lifetime warranty ECU calibration required