• Cold Air Intake for Nissan Altima (2002-2006) 2.5L Engine
  • Cold Air Intake for Nissan Altima (2002-2006) 2.5L Engine
  • Cold Air Intake for Nissan Altima (2002-2006) 2.5L Engine
  • Cold Air Intake for Nissan Altima (2002-2006) 2.5L Engine
  • Cold Air Intake for Nissan Altima (2002-2006) 2.5L Engine Default Title

Cold Air Intake for Nissan Altima (2002-2006) 2.5L Engine

$149.95
$149.95
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Tired of your Altima’s sluggish throttle and muted engine? Unlock the true potential of your 2.5L engine with an immediate upgrade that delivers crisp acceleration and a satisfying growl.

Performance Cold Air Intake for Nissan Altima (2.5L QR25DE)

The factory air intake system on your 2002-2006 Nissan Altima 2.5L is designed for quiet operation and cost-efficiency, not maximum performance. Its restrictive air box, corrugated intake tube, and paper filter choke your engine’s ability to breathe, limiting horsepower and torque, and creating a noticeable lag in throttle response.

This high-flow cold air intake system specifically addresses these limitations. By replacing the stock components with a smooth, wide-diameter induction pipe and an advanced high-flow, reusable air filter, your Altima’s QR25DE engine can draw in a significantly larger volume of cooler, denser air. This results in a more complete combustion cycle, unleashing latent power, improving acceleration, and providing a more engaging driving experience.

Why You Need This Upgrade

  • Increased Horsepower & Torque: Experience a tangible boost in engine output, making daily driving more spirited and highway passing more confident.
  • Sharper Throttle Response: Eliminate hesitation and enjoy immediate power delivery the moment you press the accelerator.
  • Enhanced Fuel Efficiency: Optimize the air-to-fuel mixture for a more efficient burn, potentially leading to better mileage under normal driving conditions.
  • Aggressive Engine Note: Transform your Altima’s sound with a deeper, sportier intake growl, especially noticeable during acceleration.
  • Durable & Long-Lasting: Constructed from high-grade, heat-resistant materials with a washable, reusable filter designed for years of reliable performance.

Technical Specifications

Fitment 2002-2006 Nissan Altima 2.5L L4 (QR25DE)
Factory Stats Stock: 175 HP / 180 lb-ft
Installation Easy / 1 Hour (Direct Bolt-on)

Replaces These OEM Applications

Compatible Vehicles:

  • 2002 Nissan Altima 2.5L L4 4-Cylinder Engine
  • 2003 Nissan Altima 2.5L L4 4-Cylinder Engine
  • 2004 Nissan Altima 2.5L L4 4-Cylinder Engine
  • 2005 Nissan Altima 2.5L L4 4-Cylinder Engine
  • 2006 Nissan Altima 2.5L L4 4-Cylinder Engine

Upgrade Your Nissan Altima Today

Don’t let a restrictive stock airbox hold back your Altima’s 2.5L QR25DE engine. Shop with confidence knowing that we deliver the best cold air intake parts with fast shipping and expert support.

Engine Safety Rating
Difficulty 

Fitment

Make

Nissan

Engine Size
  • 2.5L

Year
  • 2002
  • 2003
  • 2004
  • 2005
  • 2006

Installation & Tools

The Wrench Time

  • Estimated Time: 45-60 Minutes
  • Difficulty: 4/10 - Wrestling the factory lower resonator out of the L31 chassis fender well takes a little patience, but the top-side work is a breeze.

Tools You Will Need

  • 10mm socket, extension, and ratchet
  • 8mm socket or nut driver (for hose clamps)
  • Phillips head screwdriver
  • Panel popper tool (for fender liner clips)
  • Pliers (for the factory PCV breather clamp)
Mechanic’s Pro Tip (The "Gotcha"):
The QR25DE factory Mass Air Flow (MAF) sensor is highly sensitive, and the 2002-2006 Nissan Altima 2.5L is notorious for throwing a P0102 code if the sensor gets bumped. Treat this sensor like glass during the transfer. Secondly, the factory intake system has a massive, hidden resonator box buried inside the driver-side fender. You must use a proper panel popper tool on the plastic splash shield—pulling the liner by hand will rip the 20-year-old brittle mounting holes right out of the plastic.

Phase 1: Removing the Factory Part

  1. Disconnect the Battery: Always start by disconnecting the negative battery terminal on your 2002-2006 Nissan Altima 2.5L using a 10mm wrench to prevent check engine lights and protect the ECU.
  2. Unplug the MAF Sensor: Locate the MAF sensor on the factory intake tube. Depress the plastic tab and firmly pull the wiring harness off the sensor. Tuck the wire out of the way.
  3. Remove the Upper Airbox and Hose: Use an 8mm socket to loosen the factory hose clamp at the throttle body. Use your pliers to pinch and slide back the tension clamp on the PCV breather hose. Pull the upper rubber intake tube free from the engine.
  4. Extract the Lower Airbox Assembly: Unclip the top of the airbox and remove the factory panel filter. Remove the top bolts holding the airbox tray using your 10mm socket and pull the tray out.
  5. Defeat the Fender Resonator: Turn your steering wheel all the way to the right. Use your panel popper tool to safely pry out the plastic retaining clips holding the driver-side wheel well splash shield. Pull the liner back to expose the hidden bolts securing the lower plastic resonator. Remove the bolts with a 10mm socket and yank the bulky box out of the fender well.

Phase 2: Installing the Cold Air Intake for Nissan Altima (2002-2006) 2.5L Engine

  1. Transfer the MAF Sensor: Carefully unscrew the factory MAF sensor from the OEM housing using a Phillips head screwdriver. Gently insert it into the precision-machined flange on your new Cold Air Intake tube and secure it using the supplied hardware. Tighten the screws by hand—do not overtighten, or you will crack the mounting flange.
  2. Install the Silicone Couplers: Slide the new silicone transition coupler over the 2.5L throttle body. Slip two hose clamps over the coupler and snug the throttle body side down slightly with an 8mm socket.
  3. Route the Cold Air Piping: Feed the new aluminum intake pipe down toward the fender well where the old resonator lived. Insert the top end into the throttle body coupler. Align the welded mounting bracket to the factory chassis hole and secure it loosely using a 10mm socket.
  4. Secure the Filter and PCV Hose: Attach the high-flow conical air filter to the bottom end of the pipe in the fender well area and tighten the clamp with your 8mm socket. Reconnect the PCV breather hose to the vacuum nipple on the new intake pipe. Plug the MAF sensor harness back in until it clicks. Go back and fully tighten all hose clamps and mounting bolts.
  5. Reconnect Battery & ECU Relearn Protocol: Reconnect the negative battery terminal with your 10mm wrench. Start the engine, but do absolutely nothing else. The vehicle gas pedal should not be touched for a full 20 seconds until the ECU adjusts to the increased airflow volume. Let it idle up to operating temperature to properly calibrate the air-fuel mixture.

Disclaimer: This is a general guide provided for the 2002-2006 Nissan Altima 2.5L. Always refer to your factory service manual for exact torque specifications and safety procedures.

Warranty

All products are backed by our Limited Lifetime Warranty. We stand by our quality. [See terms]
Cold Air Intake for Nissan Altima (2002-2006) 2.5L Engine

$149.95