Catalytic ConverterAkrapovic uses performance oriented catalytic converters that give you all the sound and performance upgrades youre 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.