Akrapovic Downpipe w Cat (SS) for BMW 140i/240i/340i/440iOP Optional partDownpipe w Cat (SS) was tested and developed together with Evolution Line (Titanium) system. 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. This optional downpipe