Akrapovic Yamaha YZF-R1 2015 Optional Link Pipe/Collector The collector with interference crossover tubes is entirely made of special titanium, which gives a special hi-tech touch to this upgrade of the Slip-On Line exhaust system. The collector features additional weight savings and a performance upgrade compared to the stock system. The greatest improvement can be heard because the upgraded Slip-On exhaust system has a unique sound. THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.