Akrapovic Uses Performance-Oriented Catalytic Converters That Give You All The Sound And Performance Upgrades You’re Used To With Akrapovic Exhaust Systems.The Catalytic Converter Is A Honeycomb Metal Structure That Incorporates Precious Metals (Palladium, Rhodium, And Platinum) Into Its Surface. These Metals Convert The Poisonous Carbon Monoxide And Unburned Hydrocarbons Found In Exhaust Gases Into Non-Toxic Carbon Dioxide And Water Vapor.