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RD Series Cold Air Polished Intake System (RD1660P) by Injen. HP Gain: +10.8 hp. Includes: X-1014 Filter. The RD Series is made for the enthusiast who wants improved mid-range power. This cold air system positions a high-flow air filter behind the bumper, where it can take in cooler, denser air. The cool air then flows to the engine through a fee-flowing aluminum alloy intake tube. Cooler air contains more oxygen for more complete combustion and more horsepower.