Hyundai Tiburon 2.7L V6 2003, RD Series Polished Cold Air Intake System (RD1375P) by Injen?. 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. Up to 27.7 HP Gain.