K&N Universal Air Filter — 3.25" Flange, 5.5" Base, 4.6875" Top, 8" Height

SKU: KNNRU-5122
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Sale price$99.99
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About K&N Engineering

K&N has been the world's leader in washable, reusable performance air filters since 1969. From the legendary cone filter to complete cold-air intake systems, K&N's cotton-gauze element delivers more airflow than paper while staying serviceable for the life of the vehicle.

Watch in action

K&N Universal Rubber Air Filter RU-5122

Enhance your engine's air intake with the K&N Universal Rubber Air Filter RU-5122. Engineered for versatility, this high-flow air filter is suitable for a wide range of applications, including custom builds, racing vehicles, generators, and more. Its robust construction features a pliable rubber flange designed to absorb vibration and ensure a secure, leak-free fit on various intake setups. The filter's dimensions include a 3.25-inch flange diameter, a 5.5-inch base diameter, a 4.6875-inch top diameter, and an 8-inch height, making it adaptable to many engine configurations.

Product Highlights:

  • Versatile Fitment: Designed for universal applications, accommodating various angles and offset diameters.
  • Durable Construction: Features a strong, molded rubber flange that absorbs vibration and provides a secure attachment.
  • Washable & Reusable: K&N's signature filter media is washable and reusable, offering long-term value and performance.
  • Optimized Airflow: High-flow design allows for increased air intake, potentially improving engine performance and efficiency.
  • Easy Installation: The flexible flange can be stretched slightly for a precise fit on intake tubes.

This K&N universal air filter is built to last and designed to deliver superior filtration and airflow. Whether you're upgrading a classic car, a performance project, or specialized equipment, the RU-5122 offers reliable performance and easy maintenance. Trust K&N Engineering for quality air intake solutions.

Get your K&N Universal Air Filter today at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2004-2005 Ford Crown Victoria S
2004-2006 Ford Crown Victoria LX Sport
2004-2008 Ford Crown Victoria Base
2004-2009 Ford Crown Victoria LWB
2004-2011 Ford Crown Victoria LX
2006-2009 Ford Crown Victoria Fleet
2010-2011 Ford Crown Victoria Base
2003-2005 Ford Thunderbird Base
2004 Ford Thunderbird Pacific Coast Roadster
2005 Ford Thunderbird 50th Anniversary Edition
2003 Lincoln LS LSE
2003-2004 Lincoln LS Base
2005 Lincoln LS Ultimate
2005-2006 Lincoln LS Sport
2004-2011 Mercury Grand Marquis LS
2005 Mercury Grand Marquis GSL
2005 Mercury Grand Marquis Limited Edition
2005 Mercury Grand Marquis Ultimate Edition

Product Details

Product Description
Part Numbers
Sizing & Fit

About K&N Engineering

K&N has been the world's leader in washable, reusable performance air filters since 1969. From the legendary cone filter to complete cold-air intake systems, K&N's cotton-gauze element delivers more airflow than paper while staying serviceable for the life of the vehicle.

Watch in action

K&N Universal Rubber Air Filter RU-5122

Enhance your engine's air intake with the K&N Universal Rubber Air Filter RU-5122. Engineered for versatility, this high-flow air filter is suitable for a wide range of applications, including custom builds, racing vehicles, generators, and more. Its robust construction features a pliable rubber flange designed to absorb vibration and ensure a secure, leak-free fit on various intake setups. The filter's dimensions include a 3.25-inch flange diameter, a 5.5-inch base diameter, a 4.6875-inch top diameter, and an 8-inch height, making it adaptable to many engine configurations.

Product Highlights:

  • Versatile Fitment: Designed for universal applications, accommodating various angles and offset diameters.
  • Durable Construction: Features a strong, molded rubber flange that absorbs vibration and provides a secure attachment.
  • Washable & Reusable: K&N's signature filter media is washable and reusable, offering long-term value and performance.
  • Optimized Airflow: High-flow design allows for increased air intake, potentially improving engine performance and efficiency.
  • Easy Installation: The flexible flange can be stretched slightly for a precise fit on intake tubes.

This K&N universal air filter is built to last and designed to deliver superior filtration and airflow. Whether you're upgrading a classic car, a performance project, or specialized equipment, the RU-5122 offers reliable performance and easy maintenance. Trust K&N Engineering for quality air intake solutions.

Get your K&N Universal Air Filter today at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2004-2005 Ford Crown Victoria S
2004-2006 Ford Crown Victoria LX Sport
2004-2008 Ford Crown Victoria Base
2004-2009 Ford Crown Victoria LWB
2004-2011 Ford Crown Victoria LX
2006-2009 Ford Crown Victoria Fleet
2010-2011 Ford Crown Victoria Base
2003-2005 Ford Thunderbird Base
2004 Ford Thunderbird Pacific Coast Roadster
2005 Ford Thunderbird 50th Anniversary Edition
2003 Lincoln LS LSE
2003-2004 Lincoln LS Base
2005 Lincoln LS Ultimate
2005-2006 Lincoln LS Sport
2004-2011 Mercury Grand Marquis LS
2005 Mercury Grand Marquis GSL
2005 Mercury Grand Marquis Limited Edition
2005 Mercury Grand Marquis Ultimate Edition

Product Details

Product Description

About K&N Engineering

K&N has been the world's leader in washable, reusable performance air filters since 1969. From the legendary cone filter to complete cold-air intake systems, K&N's cotton-gauze element delivers more airflow than paper while staying serviceable for the life of the vehicle.

Watch in action

K&N Universal Rubber Air Filter RU-5122

Enhance your engine's air intake with the K&N Universal Rubber Air Filter RU-5122. Engineered for versatility, this high-flow air filter is suitable for a wide range of applications, including custom builds, racing vehicles, generators, and more. Its robust construction features a pliable rubber flange designed to absorb vibration and ensure a secure, leak-free fit on various intake setups. The filter's dimensions include a 3.25-inch flange diameter, a 5.5-inch base diameter, a 4.6875-inch top diameter, and an 8-inch height, making it adaptable to many engine configurations.

Product Highlights:

  • Versatile Fitment: Designed for universal applications, accommodating various angles and offset diameters.
  • Durable Construction: Features a strong, molded rubber flange that absorbs vibration and provides a secure attachment.
  • Washable & Reusable: K&N's signature filter media is washable and reusable, offering long-term value and performance.
  • Optimized Airflow: High-flow design allows for increased air intake, potentially improving engine performance and efficiency.
  • Easy Installation: The flexible flange can be stretched slightly for a precise fit on intake tubes.

This K&N universal air filter is built to last and designed to deliver superior filtration and airflow. Whether you're upgrading a classic car, a performance project, or specialized equipment, the RU-5122 offers reliable performance and easy maintenance. Trust K&N Engineering for quality air intake solutions.

Get your K&N Universal Air Filter today at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2004-2005 Ford Crown Victoria S
2004-2006 Ford Crown Victoria LX Sport
2004-2008 Ford Crown Victoria Base
2004-2009 Ford Crown Victoria LWB
2004-2011 Ford Crown Victoria LX
2006-2009 Ford Crown Victoria Fleet
2010-2011 Ford Crown Victoria Base
2003-2005 Ford Thunderbird Base
2004 Ford Thunderbird Pacific Coast Roadster
2005 Ford Thunderbird 50th Anniversary Edition
2003 Lincoln LS LSE
2003-2004 Lincoln LS Base
2005 Lincoln LS Ultimate
2005-2006 Lincoln LS Sport
2004-2011 Mercury Grand Marquis LS
2005 Mercury Grand Marquis GSL
2005 Mercury Grand Marquis Limited Edition
2005 Mercury Grand Marquis Ultimate Edition

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