The main parts of this system with a central muffler are constructed from high-grade lightweight titanium. The link pipes are made from high-grade stainless steel, and complex parts such as the titanium housing of the exhaust valves and the titanium tailpipe's outer shell are cast in Akrapovic's in-house foundry. The heat insulation is made from stainless steel, and each link pipe contains a 300 cpsi catalytic converter. An Evolution Line (Titanium) exhaust also has to perform. Performance power is increased by an extra 13.2 kW (17.9 hp) at 5,650 rpm, with a torque gain of 33.6 Nm at 2,400 rpm. These figures were obtained in back-to-back runs on The Akrapovic dyno against a Ferrari F8 Tributo using a standard stock exhaust. It also produces a stunning sound via the application of two valves – one on each side of the muffler – which tailor the gas flow to produce a deep racing tone fully befitting the car's V8 twin-turbocharged 3.9-litre engine.This system is also equipped with an Akrapovic Sound Kit, which makes it possible to control the sound from the cockpit. This allows the occupants of the car to easily switch between quiet mode and a sportier tone using the Sound Remote Controller, which opens and closes the exhaust valves, providing a fuller and more involved experience. Due to the nature of the exhaust system, remapping is recommended, and it is designed for use on closed course competition circuits and venues. For cars with petrol particulate filters: When installing the Evolution Line (Titanium) exhaust system, remapping the ECU is mandatory.THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE