The Evolution link pipe set upgrades the Slip-On system to the Evolution system. The Evolution link pipe set is constructed from high-quality austenitic stainless steel. It features an arrangement of two central link pipes for the best flow of the exhaust gases from the engine. It is designed to increase power and torque and reduce overall weight, while delivering a deep and sporty sound with no unwanted drone or streaming.When installing the Akrapovic Evolution link pipe set, remapping the ECU is mandatory in order to prevent potential ?check engine light? warning signals.THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.