The Wrench Time

• Estimated Time: 60-90 Minutes
• Difficulty: 3/10 - The VQ37VHR engine utilizes a dual intake system. It is essentially doing the same job twice, requiring careful handling of two separate MAF sensors and multiple brittle plastic clips.

Tools You Will Need

• 10mm socket, extension, and ratchet
• 10mm wrench (for battery terminals)
• 8mm socket or flathead screwdriver (for hose clamps)
• #2 Philips screwdriver (for factory MAF screws)
• Panel popper tool (critical for the factory radiator core support cover)
• Pliers (for factory PCV spring clamps)
• 4mm Allen wrench (for aftermarket MAF hardware)

Phase 1: Removing the Factory Part

1. Disconnect the Battery: Always start by disconnecting the negative battery terminal using a 10mm wrench. The 2008-2013 Infiniti G37 3.7L ECU is highly sensitive; failing to kill the power will trigger a Check Engine Light when you unplug the MAF sensors.
2. Remove the Core Support Cover: Use your 10mm socket to remove the bolts securing the engine cover. Then, use your panel popper tool to carefully extract the plastic push-clips holding the factory radiator shroud/core support cover. Set the cover aside.
3. Disconnect the Dual MAF Sensors: Unclip the wiring harnesses from both the driver and passenger side MAF sensors. Use a #2 Philips screwdriver to remove the two screws holding each sensor. Gently pull the sensors straight up and place them in a clean, safe location.
4. Detach the PCV Hoses: Locate the factory PCV breather hoses connected to both intake tubes. Use pliers to squeeze the spring clamps, slide them down the hose, and twist the hoses off the plastic nipples.
5. Extract the Factory Airboxes: Use an 8mm socket to loosen the hose clamps securing the corrugated rubber tubes to the twin throttle bodies. Use a 10mm socket to remove the single mounting bolt securing each lower airbox to the chassis. Lift both entire factory intake assemblies out of the engine bay.

Phase 2: Installing the Cold Air Intake for Infiniti G37 (2008-2013) 3.7L Engine - Blue

1. Prep the Throttle Bodies: Wipe the lip of both throttle bodies clean with a rag. Slide the new silicone couplers onto the throttle bodies and secure the inner hose clamps using your 8mm socket. Leave the outer clamps loose for the new tubes.
2. Transfer the MAF Sensors: Very carefully insert your factory MAF sensors into the machined brackets on your new blue intake tubes. Secure them using the provided aftermarket hardware and a 4mm Allen wrench. Do not overtighten; snug is enough to seat the O-ring.
3. Install the New Intake Tubes: Slide the new blue aluminum tubes into the silicone couplers at the throttle bodies. Line up the mounting brackets on the tubes with the factory airbox mounting holes. Secure the brackets using your 10mm socket and the factory bolts. Tighten the remaining hose clamps at the throttle body with an 8mm socket.
4. Mount the Filters and PCV Hoses: Slide the high-flow air filters onto the ends of the blue tubes and lock them down using an 8mm socket. Push the factory PCV breather hoses onto the aluminum nipples on the new tubes and slide the factory spring clamps back into place with your pliers.
5. Reconnect and Reassemble: Plug the wiring harnesses back into both MAF sensors until you hear an audible click. Reinstall the radiator core support cover using your plastic push-clips. Finally, reconnect the negative battery terminal with your 10mm wrench.
6. The ECU Relearn Protocol: Start the engine, but DO NOT touch the gas pedal for at least 20 seconds. Let the vehicle idle so the ECU can adapt to the massive increase in airflow from the new dual intakes without throwing a lean code.

Disclaimer: This is a general guide provided for the 2008-2013 Infiniti G37 3.7L. Always refer to your factory service manual for exact torque specifications and safety procedures.