According to the CN IV,V Emission Standards for gasoline cars,WEIFU has developed heat-resistant and high active TWC with 90% convertion rate fo CO,THC and NOX.By controlling the micro physical structure of alumina and oxygen-storage materials,WEIFU uses less precious metal to meet the durability requirements ie.100,000 km for CN IV and 160,000 km for CN V.The TWC serial can be flexibly installed to manifold,tight coupling or bottom position.