FOR CLOSED COURSE COMPETITION USE ONLY. NOT INTENDED FOR STREET USE.Derived from the world-championship RM-Z450WS exhaust, the Evolution Line is constructed from high-grade lightweight titanium, which saves over 20% in weight compared to a stock system, enhancing handling. It is coated in a durable finish for increased scratch resistance and easier cleaning. It has improved throttle response and the unique Akrapovic sound – which is within FIM limits – and is easy to install. The system comes with a spark arrester to comply with North American off-road regulations.