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

Boost Throttle Response & Intake Velocity for your Nissan Altima QR25DE

Who It’s For: Designed specifically for 2002–2006 Nissan Altima owners running the QR25DE engine family.

The Problem: The QR25DE is a torquey four-cylinder, but the factory air box is choked by a series of baffles and resonators designed solely to keep the car quiet. This creates a massive restriction in the intake tract, leading to sluggish throttle response and heat soak during city driving. For the L31 chassis, the stock paper filter also becomes a recurring maintenance cost that offers zero performance benefit.

The Solution: We engineered this cold air intake system to eliminate the factory bottlenecks and deliver a direct, high-velocity stream of oxygen to your engine. By replacing the restrictive plastic tubing with a high-flow mandrel-bent pipe and a reusable performance filter, we correct the factory air-starvation issues, allowing the QR25DE to breathe freely and react instantly to driver input.

Why This is the Ultimate Upgrade

• Enhanced Power Delivery: By smoothing out the airflow path, you’ll feel a noticeable increase in mid-range torque and top-end pull, making highway merging much more effortless.
• Lifetime Reusable Filter: Stop buying disposable paper filters. The included high-performance cone filter is washable and reusable, saving you money over the life of your Altima.
• True Bolt-On Installation: This kit is designed for the L31 engine bay, utilizing factory mounting points for a secure fit that requires only basic hand tools and about 45 minutes of your time.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• 2002 Nissan Altima (Base, S, SL) 2.5L L4
• 2003 Nissan Altima (Base, S, SL) 2.5L L4
• 2004 Nissan Altima (Base, S, SL) 2.5L L4
• 2005 Nissan Altima (Base, S, SL) 2.5L L4
• 2006 Nissan Altima (Base, S, SL) 2.5L L4

Interchange Part Numbers:

CAI-NA0206-25L, QR25DE-INT-02, 16576-8J000 (Filter Housing Ref)

The Performance Promise

Buy with confidence. Having spent over a decade under hoods just like yours, I can tell you the QR25DE wakes up significantly with a proper intake. You get better sound, sharper response, and easier maintenance. Backed by real automotive experts and fast shipping.

Common Questions

Will this cold air intake fit my 2002-2006 Nissan Altima 2.5L?
Yes, this system is a direct bolt-on fit for 2002, 2003, 2004, 2005, and 2006 Nissan Altima Base, S, and SL models equipped with the 2.5L L4 QR25DE engine.

Which engine and trims is this intake built for?
This intake kit is engineered specifically for Base, S, and SL trims with the 2.5L L4 QR25DE four-cylinder engine (factory rated at 175 HP and 180 lb-ft of torque).

What is included with this intake upgrade?
The system features a high-flow mandrel-bent intake pipe and a washable, reusable high-performance cone air filter to replace the restrictive factory air box.

How long does installation take and what tools are needed?
Installation takes about 45 minutes using basic hand tools and utilizes the factory mounting points on the L31 chassis.

Do I need to keep buying replacement paper filters?
The included performance cone filter is washable and reusable for the life of your Altima, eliminating recurring paper filter replacements.