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The K&N Engineering Universal Clamp-On Air Filter model KNNU-1039 is designed to provide reliable airflow across a wide range of applications including racing vehicles, generators, snowmobiles, tractors, and remote-controlled cars. Its versatile design ensures compatibility with various setups, regardless of the angle or offset diameter of the air intake. Constructed with durable, molded pliable rubber flanges, this filter absorbs vibrations and offers a secure fit while allowing for slight adjustments of up to 1/16 inch to accommodate different sizes. The filter's high-quality materials facilitate easy cleaning and reuse, making it a cost-effective choice for continuous performance. Its dimensions, including a 3-inch flange ID and a height of approximately 6 inches, make it suitable for many custom and standard installations. This filter's robust build and adaptable design make it a reliable component for enhancing engine performance and ensuring optimal airflow in diverse equipment. Please note, this product is not CARB approved but requires acknowledgment of compliance when used in regulated environments. The filter is not classified as an air freight item and is suitable for general automotive applications, ensuring ease of installation and maintenance for enthusiasts and professionals alike.
Features:
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).
