WEIFU air management systems are widely used in most diesel engines of COEMs. Turbochargers with wheel diameter range of 30 mm - 125 mm can be applied in LD, MD and HD commercial vehicles and some passenger vehicles. WEIFU now has vacuum valve control, electric control variable section turbocharger, titanium aluminum alloy roller turbocharger, electric turbocharger, ceramic ball bearings turbocharger, and gasoline engine turbocharger. These products can meet CN IV and above emission regulations.