Optional Available Headers From The Finest Titanium Offer An Upgrade To A Full System When Used With The Akrapovic Slip-On Exhaust System . Let Your Bike Stand Out With More Power , Beautiful Design, And The Unique Akrapovic Sound. Optional Headers Fit Also With Standard (First Fit) Akrapovic Silencer. For Perfect Performance, Throttle Response And Durability, ECU Remapping Is Mandatory. THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.