Yasuni is one of the market leaders in the production of high-quality, high-end racing 2-stroke exhaust systems. These decades of experience have also lead to the only 4-stroke exhaust system that has a manifold made from a number of individual items. The use of different cones and different diameters in the manifold allows best possible gas flow in conjunction with optimum power output. The advantages at a glance: 10% more power, enormous weight saving - made from AISI-10 stainless steel, carbon cone end cover, Silentblock bracket, excellent sound from special resonance chamber, street legal with E-mark.