Husqvarna Technical Accessories Akrapovic "Evolution Line" Full System Exhaust. Substantial weight saving. Increased tightening torque. Increased performance. More usable speed range. Better power delivery. Improved handling overall due to finer dosing capacity on the throttle grip. Sensitive response. Rich sound. Manifold routing optimally adapted to the production engine. Complies with current FIM noise regulations. Complies with current AMA noise regulations. Manufactured entirely from high-grade titanium. Notes: To install the silencer, the stock mounting parts must be overtaken on some models. For closed course competition use ONLY.