-12%
Click to zoom in
SKU: RU-4550 | UPC: 024844373809
K&N Universal Air Filter 4in Flange / 5-3/8in Base / 4-1/2in Top / 6in Height RU-4550
The K&N RU-4550 is a universal clamp-on air filter designed for racing vehicles radio-controlled cars generators snowmobiles tractors and more. It fits applications like 1999-2000 Honda Civic models 2001-2002 BMW 525i 2009 Mazda MX-5 Miata 2002 Mini Cooper S and 2004 Volkswagen Golf GTI VR6. This pre-oiled filter increases airflow for higher horsepower and acceleration while trapping contaminants with four layers of cotton gauze.
Key Features
- 4 Layers of Protection: Multiple layers of premium cotton gauze treated with a tacking agent create a mesh that blocks harmful contaminants from reaching the engine.
- Clean Once Every 5 Years: Requires cleaning only every 75000 miles under normal highway driving or 5 years at 15000 miles per year.
- Easy Installation: Pre-oiled and ready to use for quick clamp-on setup and cost-effective performance gains.
- Engineered Power: State-of-the-art media boosts horsepower acceleration and overall engine performance.
- Rugged Construction: Built with durable premium materials and vibration-absorbing rubber flanges that stretch up to 1/16 inch for secure fit.
Product Notes
- Flanges constructed from molded pliable rubber for secure attachment on 4in intakes regardless of angle or offset.
- Washable and reusable to reduce landfill waste from disposable filters.
- Product weight 1.6 lb ships in box 8.25in x 8.19in x 7.19in.
Installation Notes
- Professional installation recommended.
- Clamp-on design fits 4in flange diameter centered with 1.063in flange length no inner wire.
- Stretch flange up to 1.5mm for in-between sizes re-oil with 1.52 oz after cleaning.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2001-2002 | BMW | 525i | Base |
| 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 |
| 1999 | Honda | Civic | Value Package |
| 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 |
Why Choose K&N?
- Proven performance in racing and street applications worldwide.
- Washable reusable design lasts a lifetime with proper care.
- 1-Year Limited Warranty covers defects in materials and workmanship.
Frequently Asked Questions
-
Q: Will the RU-4550 fit my 1999-2000 Honda Civic LX?
A: Yes it is confirmed to fit 1999-2000 Honda Civic LX and other submodels like CX DX EX GX HX Si with 4in intake. -
Q: What material is used in this filter?
A: Four layers of premium cotton gauze media treated with a tacking agent in a round tapered shape with rubber top and flanges. -
Q: What warranty applies and how do I maintain it?
A: Backed by 1-Year Limited Warranty clean every 75000 miles wash with K&N cleaner re-oil with 1.52 oz provided oil.
Shipping & Handling
- Method: Ground Shipping
- Availability: In stock - ships same or next business day
- Packaging: Protective box 8.25 in x 8.19 in x 7.19 in
- Weight: 1.6 lb
Read More
Air Filters
Welcome to our collection of high-quality Air Filters, designed to enhance the air quality in your home or office. Our carefully curated selection features a variety of air filters suitable for different needs, ensuring you breathe easy in any environment. Whether you are looking for HEPA filters, activated carbon filters, or specialty filters, you will find the perfect solution to keep your space fresh and clean. Why Choose Our Air Filters? Our Air Filters provide exceptional performance and durability. Here are some key benefits: Enhanced Air Quality: Removes dust, allergens, and pollutants, promoting a healthier atmosphere. Energy Efficiency: Designed to optimize airflow, reducing energy costs while maintaining effectiveness. Variety of Options: Available in various sizes and types to fit most HVAC systems and air purifiers. Shop with Confidence All our Air Filters are sourced from trusted manufacturers, ensuring you receive reliable products that meet strict quality ...
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
Cold Air Intakes, Air Filters, Oil Filters & Performance Filtration Browse premium K&N Engineering performance parts and filters at Black Ops Auto Works, including cold air intakes, replacement air filters, universal air filters, oil filters, cabin air filters, fuel filters, filter cleaning kits, air intake accessories, and performance filtration upgrades for cars, trucks, SUVs, diesel applications, off-road vehicles, and performance builds. K&N is one of the most recognized names in automotive filtration and airflow technology, trusted by enthusiasts who want better airflow, reusable filter performance, and dependable engine protection. Why Choose K&N Engineering K&N products are engineered to improve airflow and support performance-focused driving across street, towing, off-road, and high-performance applications. Popular reasons drivers choose K&N include: Improved airflow and throttle response Reusable, washable air filters Long-term filtration value Veh...
View K&N Engineering Products