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Upgrade your BMW 135i, 335i, or XDrive with the K&N Engineering High-Flow Replacement Air Filter, part number knn33-2458. Designed specifically for models from 2011 to 2014, this filter features layered, oiled cotton media engineered to maximize airflow while capturing harmful contaminants. By improving air intake efficiency, this filter helps increase horsepower and engine performance without compromising protection. Its durable, reusable design ensures it remains effective for the entire lifespan of your vehicle, making it a cost-effective and eco-friendly upgrade. Easy to install as a drop-in replacement, the K&N filter fits seamlessly into your factory air box, allowing you to upgrade your vehicle*s airflow with minimal effort. Backed by K&N*s 10-year/million-mile limited warranty, this filter offers peace of mind and reliable performance over time. Whether you're seeking enhanced horsepower or improved engine protection, the K&N High-Flow Air Filter delivers consistent, high-quality results. Designed for automotive applications and suitable for various BMW models, this filter is a trusted choice for enthusiasts looking to optimize their vehicle*s intake system. Experience the difference with K&N's proven technology and enjoy superior airflow, increased power, and long-lasting durability.
Features:
Fitment:
2011 BMW 135i Base
2011 BMW 335i Base
2011 BMW 335i xDrive Base
2012 BMW 135i Base
2012 BMW 335i Base
2012 BMW 335i xDrive Base
2013 BMW 135i Base
2013 BMW 135is Base
2013 BMW 335i Base
2013 BMW 335i xDrive Base
2013 BMW X1 xDrive35i
2014 BMW 335i Base
2014 BMW 335i GT xDrive Base
2014 BMW 335i xDrive Base
2014 BMW X1 xDrive35i
2015 BMW X1 xDrive35i
Order Processing
All orders are processed and shipped within 24 hours of purchase (excluding weekends and holidays).
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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).
