Have Questions?
Professional-grade parts used trackside.
Expert help during business hours.
Encrypted checkout & trusted payments.
Orders ship quickly from regional warehouses.
The K&N Engineering Universal Rubber Air Filter Part Number KNNRU-5122 is engineered to provide reliable air filtration for a variety of vehicles and equipment. Designed with versatility in mind, this filter fits applications ranging from passenger vehicles like the 2004 and 2005 Ford Crown Victoria and Mercury Grand Marquis to industrial equipment such as generators, snowmobiles, and tractors. Its universal design ensures compatibility across different setups, making it a practical choice for custom or non-standard air intake systems. The filter features a durable molded pliable rubber flange that absorbs vibrations and allows for secure attachment, accommodating slight variations in size with up to 1/16 inch (1.5mm) stretchability for a perfect fit. Built to be washable and reusable, this air filter offers long-term value and consistent performance. The filter*s dimensions include a substantial base and height, providing ample surface area for efficient airflow and filtration, essential for maintaining engine health and performance. With a focus on durability, flexibility, and ease of maintenance, the K&N universal air filter is a trusted solution for enthusiasts and professionals seeking a dependable intake filter for diverse applications. Please note that this product is not CARB approved but requires acknowledgment of compliance for specific usage scenarios. Its robust construction and universal fit make it an ideal choice for both race vehicles and everyday machinery, ensuring optimal airflow and filtration efficiency over its lifespan.
Features:
Fitment:
2003 Ford Thunderbird Base
2003 Lincoln LS Base
2003 Lincoln LS LSE
2004 Ford Crown Victoria Base
2004 Ford Crown Victoria LWB
2004 Ford Crown Victoria LX
2004 Ford Crown Victoria LX Sport
2004 Ford Crown Victoria S
2004 Ford Thunderbird Base
2004 Ford Thunderbird Pacific Coast Roadster
2004 Lincoln LS Base
2004 Mercury Grand Marquis GS
2004 Mercury Grand Marquis LS
2005 Ford Crown Victoria Base
2005 Ford Crown Victoria LWB
2005 Ford Crown Victoria LX
2005 Ford Crown Victoria LX Sport
2005 Ford Crown Victoria S
2005 Ford Crown Victoria Special Edition
2005 Ford Thunderbird 50th Anniversary Edition
2005 Ford Thunderbird Base
2005 Lincoln LS Sport
2005 Lincoln LS Ultimate
2005 Mercury Grand Marquis GS
2005 Mercury Grand Marquis GSL
2005 Mercury Grand Marquis Limited Edition
2005 Mercury Grand Marquis LS
2005 Mercury Grand Marquis Ultimate Edition
2006 Ford Crown Victoria Base
2006 Ford Crown Victoria Fleet
2006 Ford Crown Victoria LWB
2006 Ford Crown Victoria LX
2006 Ford Crown Victoria LX Sport
2006 Lincoln LS Sport
2006 Mercury Grand Marquis GS
2006 Mercury Grand Marquis LS
2007 Ford Crown Victoria Base
2007 Ford Crown Victoria Fleet
2007 Ford Crown Victoria LWB
2007 Ford Crown Victoria LX
2007 Mercury Grand Marquis GS
2007 Mercury Grand Marquis LS
2008 Ford Crown Victoria Base
2008 Ford Crown Victoria Fleet
2008 Ford Crown Victoria LWB
2008 Ford Crown Victoria LX
2008 Mercury Grand Marquis GS
2008 Mercury Grand Marquis LS
2009 Ford Crown Victoria Fleet
2009 Ford Crown Victoria LWB
2009 Ford Crown Victoria LX
2009 Mercury Grand Marquis LS
2010 Ford Crown Victoria Base
2010 Ford Crown Victoria LX
2010 Mercury Grand Marquis LS
2011 Ford Crown Victoria Base
2011 Ford Crown Victoria LX
2011 Mercury Grand Marquis LS
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).
