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. EC/ECE Type Approved, With Integrated Catalytic Converter. Featuring Exhaust Valve For Improved Rideability In Lower Rpm.Optional Headers Fit Also With Akrapovic Standard (First Fit) / BMW Accessory Akrapovic Silencer.