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For over a decade Injen Technology Co. Ltd and our sister company has played a major role in the design and development of air intake systems. Injen Technology is based out of California in the same city and just a few miles away from the famous Pomona Winter Nationals Top Fuel Raceway. Injen Technology's history is a classic success story of a small manufacturing company turned industry leader of aftermarket performance products. What most people do not know is that Injen's sister company, RD Metal Works established in 1981, was actually designing and manufacturing air intake kits for leading air filter and intake manufacturers since the mid 1990's.