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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 &. 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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