Duoke energy located in shanghai, was founded in 2002 to support China�s rapidly growing automotive industry and to satisfy the increasing demand for vehicles with higher fuel efficiency and lower emissions. Duoke focuses on supporting world&＃039;s rapidly growing demand for modern Diesel technology for passenger cars, light and heavy commercial vehicles as well as for Off-Highway applications We specialize in Catalytic Converter Series, all kinds of spark plug, and testing machine for auto, vehicle etc. We provide design technology for miscellaneous DPF product according to customer�s requirement, high quality, and quick response are our competitive advantage. Meantime, we accept OEM & ODM order for DPF, and Turbocharge etc.