K&N Universal Air Filter RU-4550 4in Flange Chrome

SKU: KNNRU-4550
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About K&N Engineering K&N has been the world's leader in ...Read More

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Sale price$74.99
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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.

K&N Universal Air Filter - RU-4550: Performance and Versatility

Experience enhanced engine performance and filtration with the K&N Universal Air Filter RU-4550. Engineered for a wide range of applications, this high-flow air filter is designed to deliver superior airflow, leading to increased horsepower and acceleration. Its durable construction and washable/reusable design make it an economical and eco-friendly choice for enthusiasts seeking optimal engine health and performance.

Key Features and Specifications:

  • Universal Fit: Designed to fit various intake systems, including custom applications, cars, trucks, motorcycles, and more.
  • High-Flow Filtration: Utilizes K&N's renowned filtration technology to capture contaminants while maximizing airflow.
  • Durable Construction: Features a pliable rubber flange that absorbs vibration and can be stretched for a secure fit on intake tubes up to 1/16 inch larger than the base diameter.
  • Chrome Top: Adds a stylish, finished look to your engine bay or intake setup.
  • Washable & Reusable: Allows for repeated cleaning and reuse, saving you money over time.
  • Flange Inner Diameter: 4 inches
  • Base Outer Diameter: 5-3/8 inches
  • Top Outer Diameter: 4-1/2 inches
  • Height: 6 inches

Benefits of K&N Universal Air Filters:

Choosing a K&N universal air filter means investing in quality and performance. These filters are built to last, providing excellent protection for your engine against dirt and debris. The increased airflow can lead to noticeable improvements in throttle response and overall power. Whether you're building a custom project or upgrading an existing system, the RU-4550 offers a reliable and effective solution. Trust K&N and GGCRACING for your filtration needs.

Vehicle Fitment

Years Make Model Trim
2001-2002 BMW 525i Base
1999 Honda Civic Value Package
1999-2000 Honda Civic CX
1999-2000 Honda Civic DX
1999-2000 Honda Civic EX
1999-2000 Honda Civic GX
1999-2000 Honda Civic HX
1999-2000 Honda Civic LX
1999-2000 Honda Civic Si
2009 Mazda MX-5 Miata Sport
2009 Mazda MX-5 Miata SV
2009 Mazda MX-5 Miata Touring
2002 Mini Cooper S
2004 Volkswagen Golf GTI VR6

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.

K&N Universal Air Filter - RU-4550: Performance and Versatility

Experience enhanced engine performance and filtration with the K&N Universal Air Filter RU-4550. Engineered for a wide range of applications, this high-flow air filter is designed to deliver superior airflow, leading to increased horsepower and acceleration. Its durable construction and washable/reusable design make it an economical and eco-friendly choice for enthusiasts seeking optimal engine health and performance.

Key Features and Specifications:

  • Universal Fit: Designed to fit various intake systems, including custom applications, cars, trucks, motorcycles, and more.
  • High-Flow Filtration: Utilizes K&N's renowned filtration technology to capture contaminants while maximizing airflow.
  • Durable Construction: Features a pliable rubber flange that absorbs vibration and can be stretched for a secure fit on intake tubes up to 1/16 inch larger than the base diameter.
  • Chrome Top: Adds a stylish, finished look to your engine bay or intake setup.
  • Washable & Reusable: Allows for repeated cleaning and reuse, saving you money over time.
  • Flange Inner Diameter: 4 inches
  • Base Outer Diameter: 5-3/8 inches
  • Top Outer Diameter: 4-1/2 inches
  • Height: 6 inches

Benefits of K&N Universal Air Filters:

Choosing a K&N universal air filter means investing in quality and performance. These filters are built to last, providing excellent protection for your engine against dirt and debris. The increased airflow can lead to noticeable improvements in throttle response and overall power. Whether you're building a custom project or upgrading an existing system, the RU-4550 offers a reliable and effective solution. Trust K&N and GGCRACING for your filtration needs.

Vehicle Fitment

Years Make Model Trim
2001-2002 BMW 525i Base
1999 Honda Civic Value Package
1999-2000 Honda Civic CX
1999-2000 Honda Civic DX
1999-2000 Honda Civic EX
1999-2000 Honda Civic GX
1999-2000 Honda Civic HX
1999-2000 Honda Civic LX
1999-2000 Honda Civic Si
2009 Mazda MX-5 Miata Sport
2009 Mazda MX-5 Miata SV
2009 Mazda MX-5 Miata Touring
2002 Mini Cooper S
2004 Volkswagen Golf GTI VR6

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.

K&N Universal Air Filter - RU-4550: Performance and Versatility

Experience enhanced engine performance and filtration with the K&N Universal Air Filter RU-4550. Engineered for a wide range of applications, this high-flow air filter is designed to deliver superior airflow, leading to increased horsepower and acceleration. Its durable construction and washable/reusable design make it an economical and eco-friendly choice for enthusiasts seeking optimal engine health and performance.

Key Features and Specifications:

  • Universal Fit: Designed to fit various intake systems, including custom applications, cars, trucks, motorcycles, and more.
  • High-Flow Filtration: Utilizes K&N's renowned filtration technology to capture contaminants while maximizing airflow.
  • Durable Construction: Features a pliable rubber flange that absorbs vibration and can be stretched for a secure fit on intake tubes up to 1/16 inch larger than the base diameter.
  • Chrome Top: Adds a stylish, finished look to your engine bay or intake setup.
  • Washable & Reusable: Allows for repeated cleaning and reuse, saving you money over time.
  • Flange Inner Diameter: 4 inches
  • Base Outer Diameter: 5-3/8 inches
  • Top Outer Diameter: 4-1/2 inches
  • Height: 6 inches

Benefits of K&N Universal Air Filters:

Choosing a K&N universal air filter means investing in quality and performance. These filters are built to last, providing excellent protection for your engine against dirt and debris. The increased airflow can lead to noticeable improvements in throttle response and overall power. Whether you're building a custom project or upgrading an existing system, the RU-4550 offers a reliable and effective solution. Trust K&N and GGCRACING for your filtration needs.

Vehicle Fitment

Years Make Model Trim
2001-2002 BMW 525i Base
1999 Honda Civic Value Package
1999-2000 Honda Civic CX
1999-2000 Honda Civic DX
1999-2000 Honda Civic EX
1999-2000 Honda Civic GX
1999-2000 Honda Civic HX
1999-2000 Honda Civic LX
1999-2000 Honda Civic Si
2009 Mazda MX-5 Miata Sport
2009 Mazda MX-5 Miata SV
2009 Mazda MX-5 Miata Touring
2002 Mini Cooper S
2004 Volkswagen Golf GTI VR6

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