2009 – 2010 BMW 523i Replacement Air Filter By K & N
K&N® washable, reusable High-Flow Air Filters™ feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide an increase in horsepower. Each performance air filter is reusable, engineered to last for the entire lifespan of your vehicle, and backed by K&N’s 10-Year/Million Mile Limited Warranty. K&N drop-in replacement filters are designed to install easily into your factory air box. Upgrade today and start enjoying superior airflow and superior performance from K&N’s most popular product!
Features
- Emissions legal in all 50 States
- Designed to provide increased horsepower
- Multiple layers of woven cotton gauze media
- Engineered to fit easily into your factory air box
Benefits
- High air flow with excellent filtration
- Washable & reusable, and engineered to last for the life of your vehicle
- Only needs cleaning every 50,000 miles under normal highway driving conditions
