Injen RD1935BLK: Air Intake Nissan Maxima 3.0L V6 00-01, RD Series Black Cold Air Intake System (RD1935BLK) 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.