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The K&N Engineering Universal Air Filter Part Number KNNU-4450 is designed to provide versatile and reliable air filtration for a wide range of equipment including racing vehicles, generators, snowmobiles, tractors, and radio-controlled cars. Constructed with durable, molded pliable rubber flanges, this filter absorbs vibrations and ensures a secure fit. The flanges can also stretch up to 1/16 inch (1.5mm), allowing for easy adjustments to fit various intake sizes and angles. This flexibility makes the KNNU-4450 suitable for many custom and off-road applications where precise fitment is essential. The filter's design emphasizes longevity and reusability, featuring a washable element that can be cleaned and reused multiple times, reducing replacement costs and environmental impact. Its robust construction ensures consistent airflow and filtration efficiency, helping maintain optimal engine performance across different operating conditions. The KNNU-4450 is an essential component for enthusiasts seeking a dependable, high-quality air filter that adapts to multiple setups without sacrificing performance or durability. Its premium build and universal compatibility make it a valuable addition to any automotive or equipment maintenance routine, especially when custom or off-standard intake configurations are involved. Please note, this product is not EPA or CARB approved but requires acknowledgment of CARB regulations during installation, and it is not restricted from air freight shipments. Proper installation and maintenance will ensure the best performance and longevity of your equipment's air filtration system.
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).
