Cold Air Intake for Dodge RAM 1500 2500 3500 (2003-2008) 5.7L Engine

The Wrench Time

• Estimated Time: 30-45 Minutes
• Difficulty: 2/10 - Basic hand tools required. The only real challenge is wrestling the bulky factory resonator off the throttle body and handling the fragile factory sensors.

Tools You Will Need

• 10mm deep socket & ratchet (for the battery terminal and factory throttle body bolts)
• 8mm socket or 5/16" nut driver (for worm gear clamps)
• Flathead screwdriver (for releasing sensor tabs)
• Panel popper tool (to safely pry off stubborn, baked-on hoses)
• Silicone spray or soapy water (to lubricate the new rubber sensor grommet)

Phase 1: Removing the Factory Part

1. Disconnect the Battery: Always start by disconnecting the negative battery terminal using a 10mm wrench to prevent check engine lights.
2. Prep your 2003-2008 Dodge Ram Ram 1500 Ram Ram 2500 Ram 3500 1500 2500 3500 5.7L: Locate the factory Intake Air Temperature (IAT) sensor on the front passenger side of the intake tube. Depress the locking tab with a small flathead screwdriver and carefully unplug the wiring harness.
3. Remove the Breather Hose: Pull the crankcase breather hose off the factory airbox. The 5.7L under-hood plastics get extremely brittle over time, so use a panel popper to gently pry the hose back if it’s seized to the plastic fitting.
4. Unbolt the "Hemi Hat": Using your 10mm socket, remove the two bolts securing the massive factory resonator box (known by the community as the "Hemi Hat") directly to the throttle body (TB).
5. Pull the Factory System: Loosen the lower airbox hose clamp with an 8mm socket. Lift the entire Hemi hat and airbox assembly straight up off the throttle body and out of the engine bay. Once removed, carefully extract the IAT sensor from the old tube using a quarter-turn twist and set it somewhere safe.

Phase 2: Installing the Cold Air Intake

1. Mount the Heat Shield: Assemble your new heat shield weatherstripping and drop the box into the factory lower airbox mounting points. Secure it to the inner fender using the provided hardware and your 10mm socket.
2. Install the Throttle Body Coupler: Slide the new silicone step-coupler onto your throttle body. Slip on the provided hose clamps and snug the throttle body side using your 8mm socket or 5/16" nut driver, leaving the intake tube side loose.
3. Transfer the IAT Sensor: Spray a tiny amount of silicone spray (or soapy water) onto the new rubber grommet and seat it into the pre-drilled hole on your new intake tube. Gently push your factory IAT sensor into the grommet until fully seated. Do not force it or strike it!
4. Drop in the Tube: Slide the new intake tube into the throttle body coupler and route the filter end into the heat shield opening. Attach the new crankcase breather hose to the oil filler neck port. Tighten all remaining worm gear clamps with your 8mm socket and plug the factory wiring harness back into the IAT sensor.
5. ECU Calibration Startup: Reconnect your negative battery terminal. Start the truck, but do not touch the gas pedal for at least 20 seconds. This allows the ECU to read the increased airflow volume from the new intake and adjust the idle trims without throwing a lean code.

Disclaimer: This is a general guide provided for the 2003-2008 Dodge Ram Ram 1500 Ram Ram 2500 Ram 3500 1500 2500 3500 5.7L. Always refer to your factory service manual for exact torque specifications and safety procedures.