Link pipe set w Cat (SS) was tested and developed together with Slip-On Line (Titanium) system. Constructed from high-quality stainless steel, this optional addition to the Slip-On Line will enhance the sound of the exhaust, and power will be taken to greater heights. Fitted with sporty catalytic converters, installing this option increases the engine's performance and adds an aural improvement for all to appreciate. Providing improved flow for the exhaust gases, the link pipes take the 911 to greater heights. When installing Akrapovic aftermarket optional down pipes with sports catalytic converters or without catalytic converters, which are developed for use on closed tracks only, remapping the ECU is mandatory. When installing Akrapovic aftermarket exhaust system that was developed for use on closed tracks, we recommend remapping the ECU in order to prevent potential ?check engine light? warning signals. THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE. TECHNICAL DATA UNIT STOCK Akrapovic? MAX GAIN maximum power kW 294.0 / 6800 rpm 306.6 / 6550 rpm + 16.9 / 5700 rpm HP (m) 399.7 / 6800 rpm 416.9 / 6550 rpm + 23.0 / 5700 rpm HP (i) 394.2 / 6800 rpm 411.2 / 6550 rpm + 22.7 / 5700 rpm maximum torque Nm 499.2 / 3150 rpm 522.0 / 4100 rpm + 45.9 / 2300 rpm lb-ft 368.2 / 3150 rpm 385.0 / 4100 rpm + 33.9 / 2300 rpm installation time min 120 measured with: Porsche 911 Carrera /S/4/4S/GTS (991.2) 2016