K&N 33-5049 Engine Air Filter

Engine Air Filter Overview

K&N 33-5049 is a washable, reusable engine air filter built as a drop-in replacement for the factory air box. It uses layered oiled cotton gauze to improve airflow while capturing contaminants, and it is pre-oiled for installation.

Compatible with Buick Envision, Cadillac XT4, Chevrolet Malibu, Buick LaCrosse, Buick Regal Sportback, and Buick Regal TourX applications listed below, this K&N air filter is backed by a 10-Year/Million Mile Limited Warranty. The 33-5049 is a direct-fit performance upgrade for drivers looking for a reusable replacement filter.

Key Features

• Washable, reusable cotton gauze filter media
• Panel-style design with a flexible frame
• Pre-oiled filter for service-ready installation
• Drop-in replacement for the factory air box
• Backed by a 10-Year/Million Mile Limited Warranty

Detailed Description

The K&N 33-5049 replacement air filter is engineered for vehicles that use a panel-style factory filter. Its layered cotton gauze construction is designed to increase airflow while maintaining contaminant capture, making it a practical upgrade for routine maintenance and long-term service life. This part number is listed for 2021-2026 Buick Envision, 2023-2025 Cadillac XT4, 2023-2025 Chevrolet Malibu, and additional Buick and Chevrolet applications shown in the fitment data. If you are replacing a worn factory filter on a Chevrolet Malibu or Cadillac XT4, the 33-5049 provides a reusable alternative that installs in the stock air box without changing the original intake layout.

This part cross-references Wix WA10419 and Pronto PA99111 for the same application.

What It Is Used For

• Replacing a dirty or restricted factory engine air filter
• Restoring airflow through the intake system
• Reducing the need for frequent disposable filter changes
• Maintaining filtration in a reusable serviceable design
• Supporting routine air filter service on compatible Buick and Chevrolet models

Installation Notes and Tips

Install the filter in the factory air box as a direct replacement for the original panel filter. Verify the housing is clean before installation, and follow K&N service instructions for cleaning and re-oiling when maintenance is required. The filter is pre-oiled from the factory.

Quality Assurance

K&N backs this filter with a 10-Year/Million Mile Limited Warranty. The 33-5049 is part of K&N's washable, reusable high-flow filter line, built for repeated service over the life of the vehicle.