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Injen Cold Air Intake System Application: Mazda 3s Note: 2.0 and 2.3L Years: 2004 - 2007 Color: Black or Polished Part Number: RD6061 The Injen Cold Air Intake System is a great way to add power and efficiency to your Mazda 3. This Mazda3 intake system is part of the Injen RD Series line of intake systems. RD - Race Division. The RD series is a cold air intake system for the enthusiast craving mid-range power. The intake tube is strategically placed behind the front bumper to acquire colder, denser air. Although most of the RD series is a one-piece design, several are two-piece designs due to the mass air flow meters. Every RD system is certified or pending by the California Air Resource Board and backed by Injen Technology's limited lifetime warranty.