Experience a significant boost in horsepower and improved airflow with the K&N air filter designed specifically for the BMW 523i. This washable, reusable, high-flow filter offers long-term durability and efficiency, enhancing your vehicle's performance while reducing waste by eliminating the need for disposable filters.

Key Features

• Engineered for high-flow performance with 4 layers of premium, oiled cotton gauze
• Reusable design backed by a 10-Year/Million Mile Limited Warranty
• Simple drop-in installation in your factory air box
• Proven increase in horsepower and acceleration

Specifications

• Air filter dimensions: Approximately 12 x 6 x 4 inches
• Filter re-oiling: Approximately 3.5 oz of oil for optimal performance
• Overall efficiency: Up to 99% filtration
• Durable construction for long-term reliability

Maintenance & Performance

• Cleaning interval: Recommended every 75,000 miles or 5 years, depending on driving conditions
• Cost savings: Up to $125 per year compared to disposable filters
• Environmentally friendly: Reusable design reduces waste and supports sustainable practices

This Part Fits

• Year: 2011
• Make: BMW
• Model: 523i
• Submodel: Base

Upgrade your BMW’s performance with confidence. For more innovative drop-in filter options, visit our Air Filters - Drop In collection or explore the K&N Engineering range for a complete performance upgrade.