This offers the option to upgrade the Slip-On Line muffler to a full, complete system. It is made from perfectly welded stainless-steel tubes. It delivers improved sound when used in conjunction with the Slip-On Line, which gives it a racing note that will certainly be heard and appreciated. Power and torque are improved through the entire rpm range. When mounting the optional headers to the EC/ECE type-approved Slip-On Line (Titanium) exhaust system, the EC/ECE type approval is no longer valid. With optional headers, ECU remapping is required. For perfect performance, throttle response, and durability, special mapping developed by Akrapovic R&D in collaboration with our partner Rapid Bike by Dimsport has to be used. Please visit https://www.dimsport.us/en/rapid-bike/akrapovic/, where you can download the mapping. THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.