Evo Series Cold Rotomolded Induction System (EVO1800) by Injen. HP Gain: +35 hp. Torque Gain: +30 lbs. x ft.. Includes: x-1082 Filter. Includes: Air Box. The Injen Evolution Air Induction System is a dyno-tuned intake system thats 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.