aFe MACHForce XP Exhausts Cat-Back SS 16-17 BMW 340i/iX 440i/iX (F3X) L6-3.0L (B58) w/Black TipsAggressive Sound: A free flowing, transverse muffler is used to absorb high pitch tones producing a powerful sound and unleashing all available horsepower and torque. The muffler is finished with a high temp powder coated black finish and a stamped aFe power logo. Exhaust Valve: This catback exhaust system incorporates a factory style exhaust valve which uses the factory exhaust valve motor (not included). The valve helps regulate, direct and control