K&N RX-4990 Universal XStream Air Filter — 3in Flange ID, 6in Base OD, 5in Top OD, 5.94in Height

SKU: KNNRX-4990
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Sale price$119.99
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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

Maximize Airflow with the K&N RX-4990 XStream Top Universal Air Filter

The K&N RX-4990 XStream Top Universal Air Filter is engineered for enthusiasts seeking superior airflow and filtration for their performance vehicles. This filter utilizes K&N's innovative XStream design, which incorporates a secondary filter element within the filter's top. This significantly increases the total filter surface area, allowing for higher volumes of air to enter the engine while maintaining exceptional filtration efficiency. This makes it an ideal choice for demanding applications, including racing and high-performance street use.

Key Features and Benefits:

  • Increased Filter Surface Area: The XStream Top design provides substantially more surface area for maximum air intake.
  • Exceptional Filtration: Effectively captures dirt and debris, protecting your engine from wear and tear.
  • High Airflow Design: Engineered to minimize restriction, allowing your engine to breathe freely and produce more power.
  • Durable Rubber Flange: Features a pliable, molded rubber flange that absorbs vibration and ensures a secure, leak-free seal.
  • Universal Fitment: The flexible flange can be stretched slightly to accommodate various intake tube sizes, offering versatile installation options.
  • Washable and Reusable: This filter is designed for longevity and can be cleaned and re-oiled, providing long-term value and performance.

Constructed with K&N's renowned quality, the RX-4990 is built to withstand the rigors of performance driving. Its washable and reusable nature offers an eco-friendly and cost-effective solution for maintaining optimal engine health and performance. Whether for a custom build or a performance upgrade, the K&N RX-4990 ensures your engine receives the clean, unrestricted airflow it needs to perform at its best. Get yours today at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2005 Ford Focus ZX3
2005 Ford Focus ZX4
2005 Ford Focus ZX5
2005 Ford Focus ZXW

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

Maximize Airflow with the K&N RX-4990 XStream Top Universal Air Filter

The K&N RX-4990 XStream Top Universal Air Filter is engineered for enthusiasts seeking superior airflow and filtration for their performance vehicles. This filter utilizes K&N's innovative XStream design, which incorporates a secondary filter element within the filter's top. This significantly increases the total filter surface area, allowing for higher volumes of air to enter the engine while maintaining exceptional filtration efficiency. This makes it an ideal choice for demanding applications, including racing and high-performance street use.

Key Features and Benefits:

  • Increased Filter Surface Area: The XStream Top design provides substantially more surface area for maximum air intake.
  • Exceptional Filtration: Effectively captures dirt and debris, protecting your engine from wear and tear.
  • High Airflow Design: Engineered to minimize restriction, allowing your engine to breathe freely and produce more power.
  • Durable Rubber Flange: Features a pliable, molded rubber flange that absorbs vibration and ensures a secure, leak-free seal.
  • Universal Fitment: The flexible flange can be stretched slightly to accommodate various intake tube sizes, offering versatile installation options.
  • Washable and Reusable: This filter is designed for longevity and can be cleaned and re-oiled, providing long-term value and performance.

Constructed with K&N's renowned quality, the RX-4990 is built to withstand the rigors of performance driving. Its washable and reusable nature offers an eco-friendly and cost-effective solution for maintaining optimal engine health and performance. Whether for a custom build or a performance upgrade, the K&N RX-4990 ensures your engine receives the clean, unrestricted airflow it needs to perform at its best. Get yours today at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2005 Ford Focus ZX3
2005 Ford Focus ZX4
2005 Ford Focus ZX5
2005 Ford Focus ZXW

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

Maximize Airflow with the K&N RX-4990 XStream Top Universal Air Filter

The K&N RX-4990 XStream Top Universal Air Filter is engineered for enthusiasts seeking superior airflow and filtration for their performance vehicles. This filter utilizes K&N's innovative XStream design, which incorporates a secondary filter element within the filter's top. This significantly increases the total filter surface area, allowing for higher volumes of air to enter the engine while maintaining exceptional filtration efficiency. This makes it an ideal choice for demanding applications, including racing and high-performance street use.

Key Features and Benefits:

  • Increased Filter Surface Area: The XStream Top design provides substantially more surface area for maximum air intake.
  • Exceptional Filtration: Effectively captures dirt and debris, protecting your engine from wear and tear.
  • High Airflow Design: Engineered to minimize restriction, allowing your engine to breathe freely and produce more power.
  • Durable Rubber Flange: Features a pliable, molded rubber flange that absorbs vibration and ensures a secure, leak-free seal.
  • Universal Fitment: The flexible flange can be stretched slightly to accommodate various intake tube sizes, offering versatile installation options.
  • Washable and Reusable: This filter is designed for longevity and can be cleaned and re-oiled, providing long-term value and performance.

Constructed with K&N's renowned quality, the RX-4990 is built to withstand the rigors of performance driving. Its washable and reusable nature offers an eco-friendly and cost-effective solution for maintaining optimal engine health and performance. Whether for a custom build or a performance upgrade, the K&N RX-4990 ensures your engine receives the clean, unrestricted airflow it needs to perform at its best. Get yours today at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2005 Ford Focus ZX3
2005 Ford Focus ZX4
2005 Ford Focus ZX5
2005 Ford Focus ZXW

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