Click to zoom in
High-Airflow Drag Racing Top Assembly for Large-Diameter Scoop-Mount Air Cleaners
The K&N KNN66-3330R is an X-Stream air flow top assembly designed for drag racing applications requiring maximum airflow volume through a large-diameter scoop-mount air cleaner. With a 9-inch outer diameter, 7.313-inch neck flange, and 3-inch overall height, this universal top assembly is engineered to sit atop K&N's X-Stream base units to create a complete assembly that channels high-velocity air down into the carburetor or throttle body while protecting the engine from debris in the staging lanes and on the track.
Key Features
- 9-Inch Outer Diameter: Large outer diameter maximizes air flow surface area for carbureted or throttle body applications demanding high-volume induction
- X-Stream Design: Vented top directs air flow efficiently down through the base filter element while acting as a scoop mount to feed forced induction from a hood scoop
- 7.313-Inch Neck Flange: Large neck flange provides a stable mounting surface over the base filter assembly with positive retention
- 3-Inch Height: Low-profile 3-inch height keeps the overall assembly height manageable for hood scoop fitment and carb clearance
- Universal Drag Racing Fit: Not vehicle-specific; designed for any drag racing build using a compatible X-Stream base unit
- K&N Engineering Quality: Manufactured to the same dimensional and material standards as K&N's full air filter product line
Specifications
| Detail | Value |
|---|---|
| Part Number | KNN66-3330R |
| Brand | K&N Engineering |
| Outer Diameter | 9 in |
| Neck Flange Diameter | 7.313 in |
| Height | 3 in |
| Style | X-Stream Top Assembly |
| Fit | Universal (drag racing) |
| UPC | N/A |
What's Included
- 1x X-Stream top assembly
About K&N Engineering
K&N Engineering has been manufacturing performance air filters, intake systems, and air flow components since 1969. Based in Riverside, California, K&N products are used across motorsport disciplines from drag racing and circle track to off-road and road racing, as well as on millions of street-driven performance vehicles worldwide.
Related Parts on Our Site
Frequently Asked Questions
What is this top assembly?This is a K&N KNN66-3330R X-Stream air flow top assembly with a 9-inch outer diameter, 7.313-inch neck flange, and 3-inch height, designed for drag racing air cleaner builds that use a hood scoop to force-feed air to the engine. It is a universal component for use with compatible X-Stream base filter units.
Is a base filter included?No. This is the top assembly only. A compatible X-Stream base filter unit is required to complete the air cleaner assembly; the base unit and any carb hat or adapter plate are sold separately.
What vehicles does this fit?This is a universal drag racing component not designed for any specific vehicle. It is intended for competition builds using a hood scoop-fed air cleaner setup. Confirm that your base unit dimensions match the 7.313-inch neck flange before ordering.
Can this be used on a street car?This is primarily a competition-oriented component, but it can be used on any street vehicle with a compatible X-Stream base assembly and sufficient hood clearance. Street use without a scoop means the top primarily acts as a rain and debris deflector over the filter element.
What is the purpose of the X-Stream design?The X-Stream design uses a vented top configuration that directs inbound scoop air efficiently down through the filter element to the carburetor or throttle body. It is engineered to maximize airflow volume in applications where a ram-air or hood scoop is feeding forced air into the air cleaner from above.
Does this fit a standard 14-inch air cleaner base?No. This top assembly is designed for K&N's X-Stream base units, not for standard round air cleaner bases. The 9-inch outer diameter and 7.313-inch neck flange are specific to the X-Stream product family. Verify base unit compatibility before ordering.
Is this component reusable?Yes. The top assembly itself does not require replacement as part of routine maintenance. Maintenance intervals apply to the underlying filter element in the base unit, not the top cap.
What material is the top assembly made from?This component is manufactured to the same dimensional and material standards as K&N's air cleaner product line. Refer to K&N's product documentation for the specific material call-out if material confirmation is needed for your application.
Installation Instructions
- Confirm the X-Stream base unit is properly installed and seated on the carburetor or throttle body adapter.
- Position the top assembly over the base filter element, aligning the neck flange concentrically with the base unit.
- Press the top assembly down onto the base unit until fully seated and the flange sits flush against the top of the filter element.
- Secure the top assembly to the base unit per the recommended retention method (wing nut or stud, depending on base unit configuration).
- Verify the assembly is centered over the carb or throttle body and does not contact the hood scoop opening or adjacent components.
- If using with a hood scoop, align the scoop opening directly over the top assembly before fastening the scoop in final position.
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 Products