SP Series Cold Air Polished Intake System (SP1873P) by Injen. HP Gain: +16.1 hp. Torque Gain: +13.4 lbs. x ft.. Includes: X-1015 Filter. Converts to Short Ram. The SP Series Cold Air Intake System is made for the enthusiast who wants maximum horsepower from a tuned cold air intake system. This cold air system positions a high-flow air filter behind the bumper, where it can take in cooler, denser air. Cooler air contains more oxygen for more complete combustion and more horsepower.