With a distinctive sound as you shift through the gears, coupled with enhanced power and torque, all encapsulated in a full titanium system, the Slip-On Line (Titanium) offers The Akrapovic experience while meeting ECE type approval. Constructed from lightweight high-grade titanium alloys and finished with two sets of carbon-fibre / titanium tailpipes, the system features complex parts crafted at the in-house titanium foundry, including the housing of the valves and collectors from the central muffler to the tailpipes. Two valves – one on each side of the muffler – tailor the gas flow to help produce that unmistakable Akrapovic sound, which is distinctly different from the X5M with a stock system. The exhaust tone is most noticeable as you move through the gears and accelerate, and this can be further controlled through the addition of the optional Akrapovic Sound Kit to provide increased aural pleasure. Akrapovic has achieved power gains of 12.1 hp at 2,400 rpm and torque increases of 35.4 Nm at 2,400 rpm when tested on The Akrapovic dyno against a BMW X5M with a stock M Sport exhaust system for comparison.