Click to zoom in
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
Air Filters
Shop automotive air filters and performance intake filters at Black Ops Auto Works for direct-fit air filters, drop-in replacement filters, universal clamp-on filters, cabin air filters, engine breather filters, HVAC filters, pre-filters, velocity stacks and intake filter accessories for cars, trucks, SUVs, Jeeps, muscle cars, diesel trucks, import performance builds and custom intake setups. This Air Filters collection is built for enthusiasts who want cleaner airflow, better filtration, improved engine protection, reusable performance filter options, replacement intake filters and vehicle-specific air filter fitment. Browse air filters for Dodge Charger, Dodge Challenger, Dodge Durango, Jeep Grand Cherokee, Jeep Grand Cherokee Trackhawk, Ram TRX, Chevrolet Camaro, Chevrolet Corvette, Cadillac CT5, Ford Mustang, Ford F-150, Toyota Tacoma, Toyota Tundra, BMW, Honda, Infiniti, Nissan, Porsche and other performance platforms. Shop Automotive Air Filters by Category Find the right air ...
View Air Filters Products
Air Filters - Universal Fit
Welcome to our exclusive collection of Air Filters - Universal Fit, designed to meet the diverse needs of your vehicle. These filters are essential for maintaining optimal engine performance and air quality, ensuring a smoother ride and enhancing the longevity of your automobile. Our universal fit air filters are crafted with quality materials, providing superior filtration efficiency and ease of installation. Key Features of Our Air Filters - Universal Fit Versatile Compatibility: These air filters are designed to fit a wide range of vehicles, making them a smart choice for any car owner. High Filtration Efficiency: Our filters effectively trap dirt, dust, and debris, ensuring only clean air enters your engine. Easy Installation: With a universal fit design, installation is straightforward and can be done without professional help. Durable Construction: Made from high-quality materials, our air filters are built to last, providing reliable performance. Why Choose the ri...
View Air Filters - Universal Fit Products
K&N Engineering
Shop K&N Engineering cold air intakes, reusable air filters, oil filters, cabin filters, fuel filters and performance filtration upgrades at Black Ops Auto Works for cars, trucks, SUVs, diesel builds, off-road vehicles, muscle cars, Jeeps, Mopar platforms and custom performance applications. K&N Engineering is one of the most recognized names in automotive filtration and airflow technology. This collection includes K&N cold air intake systems, high-flow replacement air filters, universal clamp-on air filters, drop-in filters, oil filters, cabin air filters, fuel filters, Dryflow filters, filter cleaning kits, intake adapters, air intake accessories and performance filtration parts for street, towing, off-road, diesel and high-performance builds. Shop K&N Engineering Products by Category Find the right K&N performance filtration upgrade using related Black Ops Auto Works categories. Shop cold air intakes, air intake systems, air intake components, automotive air f...
View K&N Engineering ProductsLet customers speak for us
Looks pretty nice
Looks pretty nice, pricing was good and the reinforcement is a big plus.
Randy H.
Black Ops Auto Works
I emailed customer service to inquire about when it would be shipped
I emailed customer service to inquire about when it would be shipped. They checked and emailed me with the answer. Customer service is A1
Ralph J.
Black Ops Auto Works
Installation was easy
Installation was easy. The price is good and it looks great on the truck.
Ralph J.
RHO Small Grille Badge
Looks as good as it fits
Looks as good as it fits,
zachary d.
Seibon 70-73 Datsun 240Z OE Carbon Fiber Hood
Nothing like it
I love it great sound and response
Luis P.
Legmaker Dodge Durango HEMI Short Ram CAI 2011-Present 5.7L
Car totally diferent with the whole kit
Car totally diferent with the whole kit. Ive stood next to wide bodies and my car gets more attention at times . Ive bought the kit twice already.
Ding D.
2015-2023 Dodge Charger Carbon Fiber Wind Splitters
Fantastic emblem! Exactly what I was looking for
Fantastic emblem! Exactly what I was looking for. Great quality emblem.
Jacobus S.
Direct Connection Black Metallic Fender Badge
Worked great for my aftermarket hood on my Chrysler 2023 300C
Worked great for my aftermarket hood on my Chrysler 2023 300C. Thanks
Robert G.
Windshield Washer Squirter Relocation Kit Universal
Easy to install and makes car sound even better
Easy to install and makes car sound even better love the winn
Tracy H.
Legmaker Challenger/Charger Hellcat Demon & Redeye Air Intake
Awesome customer support
Awesome customer support. Had multiple issues with fedex and these guys were excellent in helping me sort everything out. The drop springs are great too! I highly recommend
Anonymous
Swift Spec-R Lowering springs Jeep Grand Cherokee 2011-2021
100/100! perfect CF crafted cold air intake for 6
100/100! perfect CF crafted cold air intake for 6.4 jeep .. even makes my AWE exhaust sound even deeper and you cam here this thing sucking when accelerating even at normal speeds🥶
srt.boizzz
Legmaker 392 TH Short Ram Jeep Grand Cherokee SRT 2012-2021
