Evolution Race Header Set converts the slip-on system into a full system, built for the track and gives the Porsche GT3 RS the extra performance to match. Handcrafted titanium headers incorporate 100 cpsi sports catalytic convertors and titanium flangescast in Akrapovics own foundry. The system offers a perfect power curve, designed to continually increase performance as the revs rise. Along with improved torque and the maximum weight savings to enhance handling, adding the Evolution Race Header (Set) will have the car performing like a true cup racerwith a deep, loud, and powerful Akrapovic racing sound to match its performance.When installing Akrapovic aftermarket optional link 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.