This offers the option to upgrade the Slip-On Line 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, especially from the mid-range upwards.For perfect performance, throttle response and durability, ECU remapping is mandatory.THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.