Downpipe 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 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. When installing the Akrapovic downpipe, remapping the ECU is mandatory in order to prevent potential "check engine light" warning signals. Downpipe is optional product to the following evolution systems: Toyota Supra (A90) without OPF: Slip-On Line (Titanium) + Evolution Link pipe (SS) - S-TY/T/1H + E-TY/SS/1 BMW Z4 M40i (G29) without OPF: Slip-On Line (Titanium) + Evolution Link pipe (SS) - S-BM/T/9H + E-TY/SS/1 BMW M340I (G20) without OPF: Slip-On Line (Titanium) + Evolution Link pipe (SS) - S-BM/T/17H + E-BM/SS/8 BMW M440I (G22) without OPF: Slip-On Line (Titanium) + Evolution Link pipe (SS) - S-BM/T/18H + E-BM/SS/8 THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.