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