This is a top-of-the-range full system beautifully crafted from high-grade ultra-lightweight titanium. It is the lightest Akrapovič complete exhaust system, weighing just 4.2 kg – which is over 60% lighter than the stock system. The muffler and headers are constructed entirely from titanium. Its distinctive shape was developed especially for the Yamaha YZF-R1 based on Akrapovič’s vast racing experience. Increased power and torque through the whole rpm range, especially in the mid range and top end,making this the best Akrapovič exhaust upgrade for performance. The deep, true racing sound is perfectly tuned to match the increased performance. It offers easy-to-fit installation. The system can also be mounted on YZF-R1M model. THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.