This product is crafted from high-grade, lightweight titanium for a weight reduction of 45% (14.5 kg) compared to the sport stock exhaust. This exhaust system features a central muffler with valves on both sides ? with valve housings cast in-house ? to regulate the gas flow before it exits through two pairs of attractive double round handmade carbon-fibre tailpipes that contain acoustic reflectors to deliver enhanced sound to the passenger cabin. A comfortable sound with a pleasant V8 back track is emitted at cruising speed, which becomes sportier when driven more dynamically and through the use of the car's mode selectors. When tested on The Akrapovic dyno against a Porsche Cayenne Turbo E-Hybrid with a stock sport exhaust system, it achieved a power gain of 4.0 kW (5.4 hp) at 2,100 rpm and a torque increase of 18.6 Nm at 2,050 rpm. This product has plug-and-play installation and no need for remapping.An optional Akrapovic Sound Kit is available, which will increase the aural pleasure of The Akrapovic Evolution Line (Titanium) exhaust at lower revs and further supplement the sound as the revs rise.With the use of the optional Akrapovic Sound Kit, the ECE type approval of the Evolution Line (Titanium) is no longer valid.The Evolution Line (Titanium) exhaust system is ECE type approved for cars equipped with Otto/gasoline particulate filters.This Evolution Line (Titanium) does not fit on Cayenne GTS Coupe with optional Sports exhaust system with central tailpipes. This system does not fit on model Cayenne Turbo E-Hybrid Coupe with GT-Package.