This exhaust is constructed from high-grade lightweight titanium and features a central muffler that expands to produce two sets of tailpipes, with a choice of either a titanium or carbon-fibre finish designed to complement the lines of the car. Two valves on either side of the muffler control the airflow and are contained in valve housings cast in the Akrapovi? in-house foundry. Fully ECE type approved, the Evolution Line (Titanium) will reduce overall vehicle weight while delivering extra power and torque through the whole rev range. With a specially developed and tuned sound, the system delivers a very high-frequency and sporty tone, especially when the car is in the higher rev range. In the normal mode, the sound is quiet and ideal for town driving and cruising, but it still has the unmistakable Akrapovi? feel. Installation is plug&play, with no need to remap the ECU.An optional Akrapovi? Sound Kit is available, which will increase the aural pleasure at lower revs and further supplement the sound as the revs rise, adding a thrill to the launch of the car from a standstill. With the use of the optional Akrapovi? Sound Kit, the ECE type approval is no longer valid.