Upgrade your performance with our K&N washable air filter for the BMW 525i, engineered to deliver increased horsepower, improved airflow, and enhanced engine performance. Benefit from our advanced layered oiled cotton media filter that not only boosts your engine’s efficiency but also comes with a 10-Year/Million Mile Limited Warranty. Whether you're looking for a K&N 04 BMW 525i air filter or the best air filter for your 2004 BMW 525i, this filter is an excellent upgrade for both experienced enthusiasts and new drivers.

Product Highlights

• Designed to provide a noticeable horsepower boost and improved engine efficiency.
• Made with high-flow, oiled cotton media to maximize airflow and trap contaminants.
• Features a drop-in design for easy installation in factory air boxes.
• Washable and reusable for long-term, cost-effective performance.
• Environmentally friendly solution that helps reduce waste.

Technical Specifications

• Constructed with a multi-layer design for optimal protection and performance.
• Engineered to meet strict quality and durability standards.
• Precisely designed to ensure a perfect fit with your vehicle’s factory air system.

Compatible BMW Models

• 2004-2007 BMW 525i – Base
• 2006-2007 BMW 525xi – Base
• 2008-2010 BMW 528i – Base
• 2009-2010 BMW 528i xDrive – Base
• 2008 BMW 528xi – Base
• 2004-2007 BMW 530i – Base
• 2006-2007 BMW 530xi – Base
• 2007-2008 BMW Z4 – M Coupe/M Roadster

Upgrade today and experience exceptional performance! Discover more in our Air Filters - Drop In collection.