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K&N Filter Universal X Stream Clamp-On 3 inch Flange 6 inch Base 5 inch Top 5 9/16 inch Height K&N Engineering KNNRX-4990
K&N Filter Universal X Stream Clamp-On 3 inch Flange 6 inch Base 5 inch Top 5 9/16 inch Height K&N Engineering KNNRX-4990
K&N Filter Universal X Stream Clamp-On 3 inch Flange 6 inch Base 5 inch Top 5 9/16 inch Height K&N Engineering KNNRX-4990
K&N Filter Universal X Stream Clamp-On 3 inch Flange 6 inch Base 5 inch Top 5 9/16 inch Height K&N Engineering KNNRX-4990
K&N Filter Universal X Stream Clamp-On 3 inch Flange 6 inch Base 5 inch Top 5 9/16 inch Height K&N Engineering KNNRX-4990
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K&N Filter Universal X Stream Clamp-On 3 inch Flange 6 inch Base 5 inch Top 5 9/16 inch Height

KNNRX-4990
024844094773
Air Filters - Universal Fit
20+ Units In Stock - Ships Next Business Day
$ 115.00 $ 100.79
$ 100.79

SKU: RX-4990 | UPC: 024844094773

K&N RX-4990 Universal X-Stream Clamp-On Air Filter 3in Flange 6in Base 5in Top 5-9/16in Height for 2005 Ford Focus

The K&N RX-4990 is a universal X-Stream clamp-on air filter designed for custom performance applications including 2005 Ford Focus ZX3 ZX4 ZX5 ZXW models. This round tapered filter features a 3-inch centered flange base outside diameter of 6 inches top outside diameter of 5 inches and 5-9/16-inch height for direct clamp-on installation. It delivers high airflow through its innovative X-Stream top while providing reliable engine protection in racing or street environments.

Key Features

  • X-Stream Top Design: Includes a pleated filter built into the top for increased surface area more airflow and extended service intervals
  • Clamp-On Installation: Molded pliable rubber flanges absorb vibration secure firmly and stretch up to 1/16-inch to fit in-between sizes
  • Low Restriction Flow: Cotton gauze media allows maximum air intake with minimal resistance for improved engine breathing
  • High Filtration: Four-layer progressive cotton gauze traps dirt dust and debris while maintaining peak performance
  • Washable Reusable: Clean with K&N cleaning kit and re-oil for repeated use without replacement

Product Notes

  • Flange inside diameter 3 inches flange length 1.313 inches centered flange type
  • Follow K&N cleaning instructions for longest life
  • Net weight 1.6 pounds

Installation Notes

  • Professional installation recommended.
  • Clamp directly to 3-inch inlet or carburetor spacer using hose clamps
  • Compatible with custom intake setups verify flange match before install

This Part Fits

Year Make Model Submodel
2005 Ford Focus ZX3
2005 Ford Focus ZX4
2005 Ford Focus ZX5
2005 Ford Focus ZXW

Why Choose K&N?

  • Decades of leadership in performance filtration for millions of vehicles
  • Engineered with precision for airflow gains and dust protection
  • Backed by rigorous dyno testing and real-world racing results

Frequently Asked Questions

  • Q: Does the RX-4990 fit 2005 Ford Focus models?
    A: Yes it fits 2005 Ford Focus ZX3 ZX4 ZX5 ZXW with 3-inch intake flange in clamp-on applications.
  • Q: What filter media does it use?
    A: Four-ply cotton gauze oiled media for balanced airflow and dirt-holding capacity.
  • Q: What warranty applies?
    A: K&N No-Hassle Lifetime Limited Warranty covers defects in materials or workmanship.

Shipping &amp. Handling

  • Method: UPS Ground
  • Availability: In stock - ships same or next business day
  • Packaging: Protective box 7.125 x 7.125 x 6.75 inches
  • Weight: 1.6 pounds
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