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.