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Evo Series Cold Rotomolded Induction System (EVO2001) by Injen. Includes: X-1089 Filter. Includes: Air Box. The Injen Evolution Air Induction System is a dyno-tuned intake system that's designed to enhance air flow for maximum horsepower and torque gains on your truck. Designed using the latest CAD software, the Rotomolded, cross-linked polyethylene construction allows for outstanding durability and heat insulation while reducing restriction levels for impressive fuel economy gains.