Have Questions?
Professional-grade parts used trackside.
Expert help during business hours.
Encrypted checkout & trusted payments.
Orders ship quickly from regional warehouses.
Give your BMW 5 Series or Z4 a breath of fresh air with the K&N Engineering Original Lifetime Engine Air Filter, precision-engineered for select 2004–2010 BMW models with 2.5L and 3.0L L6 engines. Designed to drop directly into your factory air box, this reusable filter enhances airflow while maintaining superior filtration to protect your engine from harmful debris.
Constructed with multiple layers of oiled cotton gauze, the filter promotes smoother, unrestricted intake flow for improved throttle response and horsepower gains. The washable design allows for repeated cleaning and re-oiling throughout the life of your vehicle—eliminating the need for disposable filters and reducing maintenance costs.
Built for long-term durability and backed by K&N’s renowned 10-Year/Million-Mile Limited Warranty, this air filter is the ideal upgrade for BMW drivers who demand performance, reliability, and sustainability in one package.
Whether you’re chasing better acceleration or simply want a dependable replacement that lasts, K&N’s advanced filter technology delivers consistent results with every drive.
Features:
Layered, oiled cotton media for maximum airflow and filtration efficiency
Washable and reusable for the lifetime of your vehicle
Direct drop-in replacement for factory air filters
Designed to improve horsepower and throttle response
Backed by K&N’s 10-Year/Million-Mile Limited Warranty
Durable construction built to withstand repeated cleanings
Compatible with select BMW 5 Series and Z4 models (see fitment below)
Helps improve engine efficiency and long-term protection
Fitment:
BMW 525i Base 2004
BMW 525i Base 2005
BMW 525i Base 2006
BMW 525i Base 2007
BMW 525xi Base 2006
BMW 525xi Base 2007
BMW 528i Base 2008
BMW 528i Base 2009
BMW 528i Base 2010
BMW 528i xDrive Base 2009
BMW 528i xDrive Base 2010
BMW 528xi Base 2008
BMW 530i Base 2004
BMW 530i Base 2005
BMW 530i Base 2006
BMW 530i Base 2007
BMW 530xi Base 2006
BMW 530xi Base 2007
BMW Z4 M Coupe 2007
BMW Z4 M Coupe 2008
BMW Z4 M Roadster 2007
BMW Z4 M Roadster 2008
Order Processing
All orders are processed and shipped within 24 hours of purchase (excluding weekends and holidays).
Orders placed after 3:00 PM EST may ship the following business day.
Shipping Methods
Customers select their preferred shipping method and speed at checkout.
Shipping times are determined by the carrier and cannot be guaranteed by us.
Tracking information will be provided once your order has shipped.
Shipping Coverage
If your package arrives damaged, please notify the delivery driver immediately and contact the shipping carrier to file a claim.
You must report any missing or damaged items within 14 days of delivery.
After this time, we cannot be held responsible for lost or damaged items.
Return Window
You have 30 days from the date of delivery to request a return.
After 30 days, we are unable to accept returns, exchanges, or refund requests.
Eligibility
Items must be returned in their original condition—unused, unwashed, and with all tags and packaging intact.
Certain products may not be eligible for return (e.g., special-order items, customized products, or perishable goods).
Items that have been altered, installed, or modified cannot be returned.
Return Process
Contact our Customer Support team to request a Return Authorization (RMA) before sending items back.
Once your return is approved, you’ll receive instructions on where to send the product.
Customers are responsible for return shipping costs unless the item was defective or incorrect.
Refunds
Refunds are issued to the original payment method once the returned item has been received and inspected.
Please allow 5–10 business days for the refund to appear on your account.
In some cases, a restocking fee may apply (if applicable, this will be disclosed during your return authorization).
