Constructed from lightweight, high-grade titanium alloys Saving of 19.7% (0.8 kg) over the standard stock exhaust Added strength created by the design to provide enhanced resilience under the most demanding conditions Offering an increased response through the entire rev range, the Evolution Line (Titanium) has a new profiled surface, which influences the deep, full sound, and an integrated resonance chamber for optimum performance befitting the sound of an Akrapovic exhaust, all designed to meet FIM noise limits for competition Developed for use on closed-course competition circuits only Simple plug-and-play operation to install, with no remapping needed. EXHAUST TI YAMAHA WR YZ250F YX250FX