K&N 33-2399 Engine Air Filter

K&N 33-2399 Replacement Air Filter

K&N 33-2399 is a washable, reusable high-flow engine air filter built with layered, oiled cotton gauze media. It installs in the factory air box and is designed to improve airflow while capturing contaminants for Nissan 370Z and INFINITI applications.

Key Features

• Cotton gauze filter media for high-flow filtration
• Panel-style air filter with a flexible frame
• Pre-oiled filter media for service-ready installation
• Washable and reusable design for long service life
• Outside dimensions: 7.125 in. x 6.625 in. x 1 in.
• Backed by K&N’s 1,000,000-mile/10-year limited warranty

Detailed Description

This K&N replacement air filter is engineered as a drop-in upgrade for the factory air box, making it a direct service part for select Nissan and INFINITI models. The layered cotton gauze construction is designed to balance airflow and filtration, helping maintain engine breathing performance while keeping out airborne debris. The K&N 33-2399 is a practical choice for drivers who want a reusable engine air filter for a Nissan 370Z, INFINITI G37, or INFINITI QX50 without changing the stock intake layout. This part cross-references Wix 49362 for the same application.

Vehicle Fitment

• Fits 2009-2020 Nissan 370Z, N/A
• Fits 2014-2017 INFINITI QX50, N/A
• Fits 2015 INFINITI Q40, N/A
• Fits 2014-2015 INFINITI Q60, N/A
• Fits 2013 INFINITI EX37, N/A
• Fits 2008-2013 INFINITI G37, N/A
• Fits 2008-2012 INFINITI EX35, N/A
• Fits 2011-2012 INFINITI G25, N/A
• Fits 2007-2009 Nissan 350Z, N/A
• Fits 2007-2008 INFINITI G35, N/A

What It Helps Address

• Restricted airflow from a dirty or clogged factory air filter
• Routine air filter replacement on Nissan 370Z and INFINITI models
• Need for a reusable engine air filter instead of disposable paper media
• Maintenance of intake filtration in stock air box setups

Installation Notes and Tips

Install the K&N 33-2399 directly into the factory air box following the vehicle service procedure. Verify the air filter dimensions and housing shape before installation, and clean the air box before fitting the new filter. Because the filter is pre-oiled, avoid adding oil unless service intervals require re-oiling after cleaning.

Quality Assurance

K&N backs this replacement air filter with a 1,000,000-mile/10-year limited warranty. The washable, reusable design is built for long-term service across the listed Nissan and INFINITI fitments.