Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
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K&N Engineering
K&N RU-4550 Universal Air Filter - 4in Flange, 5-3/8in Base, 4-1/2in Top, 6in Height - Select 1999-2009 BMW, Honda, Mazda, Mini, and VW
$78.99
This product will be available for sale in 2 weeks, but you can pre-order now to receive 10% discount!
Fits select 1999-2009 BMW 525i, Honda Civic, Mazda MX-5 Miata, Mini Cooper S, and Volkswagen Golf GTI VR6.
K&N Universal Air Filters are engineered for high airflow and superior filtration across a wide range of racing and specialty applications. This round tapered filter (MPN: RU-4550) replaces restrictive factory elements with washable, reusable media. The filter is constructed with an ultra-strong, molded pliable rubber flange designed to absorb engine vibration while providing a secure mounting point.
- Precision Dimensions: 4-inch flange inside diameter, 5-3/8-inch base diameter, 4-1/2-inch top diameter, and 6-inch total height.
- Adjustable Flange: The flexible rubber flange can be stretched up to 1/16 of an inch (1.5mm) to accommodate varied intake sizes.
- Performance Ready: Pre-oiled from the factory for immediate installation and filtration efficiency.
- Durability: Constructed with high-quality materials to withstand racing environments; includes a One Year Limited Warranty.
- Part Number: RU-4550
🔧 Fitment & Compatibility
| 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 | Grand Touring |
| 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 |
Choose your Location
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Atlus
1340 Cobb Dr, Unit 1, Eustis, FL 32736
352-234-4458
Mon – Fri: 8:30 am – 4:30 pm
Sat: 9:00 am – 2:00 pm
Sun: Closed
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If you can find the part for a lower price from an authorized dealer/shop, we'll match the price! Reach out to Hello@AtlusAuto.com, our live chat located at the bottom right of your screen, or request an Atlas Price Guarantee, or visit our dedicated APG page to submit a request.
K&N RU-4550 Universal Air Filter - 4in Flange, 5-3/8in Base, 4-1/2in Top, 6in Height - Select 1999-2009 BMW, Honda, Mazda, Mini, and VW
$78.99
This product will be available soon, but you can pre-order now to get on the list before others!
US Based Support - In Florida
30 Days Satisfaction Guarantee
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Share:
$78.99
$78.99
$78.99
Fits select 1999-2009 BMW 525i, Honda Civic, Mazda MX-5 Miata, Mini Cooper S, and Volkswagen Golf GTI VR6.
K&N Universal Air Filters are engineered for high airflow and superior filtration across a wide range of racing and specialty applications. This round tapered filter (MPN: RU-4550) replaces restrictive factory elements with washable, reusable media. The filter is constructed with an ultra-strong, molded pliable rubber flange designed to absorb engine vibration while providing a secure mounting point.
- Precision Dimensions: 4-inch flange inside diameter, 5-3/8-inch base diameter, 4-1/2-inch top diameter, and 6-inch total height.
- Adjustable Flange: The flexible rubber flange can be stretched up to 1/16 of an inch (1.5mm) to accommodate varied intake sizes.
- Performance Ready: Pre-oiled from the factory for immediate installation and filtration efficiency.
- Durability: Constructed with high-quality materials to withstand racing environments; includes a One Year Limited Warranty.
- Part Number: RU-4550
🔧 Fitment & Compatibility
| 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 | Grand Touring |
| 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 |
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We only sell authentic products from verified brand partners and retail partners globally.
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