Optional available headers from the finest stainless steel offer an upgrade to a full system when used with the Akrapovi? Slip-On exhaust system. Let your bike stand out with more power, beautiful design, and the unique Akrapovi? sound.Optional headers fit also with Akrapovi? standard (first fit) / BMW accessory Akrapovi? silencer. For perfect performance, throttle response and durability, special developed mapping is recommended.FITMENT NOTICE FOR US MARKET: Optional header fits on 2020 S 1000 RR US model. For 2019 US models, see products listed under 2018 model year.THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.