The catalyst in the catalytic converter is coated with CeO2 rare earth and palladium-platinum-rhodium.Depending on the requirements of different emission standards,the concentration of precious metals reaches 1000-2600 ppm or higher,which is more than 3-4 as much as the ordinary E.P.A. standard products on the market.Far more than what is required to pass the emission test.It has the ability to maintain long-term effect and keep the engine check engine light no longer come P0420 code.