Akrapovic Stainless Steel Down Pipe (w/ Cat) - F3X 340i/440i | F2X M240i The high-flow downpipe is constructed using high-quality stainless steel and, once fitted to the Evolution Line exhaust, it creates a complete system from the manifold to the tailpipes that will further enhance the performance figures: both the torque and power outputs. It incorporates a sporty catalytic converter – which is type-approved to meet ECE regulations, making the whole system ECE compliant – and so no remapping is needed for this performance upgrade. This optional downpipe produces an enhanced sound that delivers a pure racing emotion and fantastic feedback at high revs, without unwanted drone, making it suitable for everyday use. FEATURES: +17.7 HP @ 5900 RPM +12.7 lb/ft @ 4000 RPM 1.0 lb Lighter than stockInstallation Instructions