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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.
- 3-Inch Height: Low-profile 3-inch height keeps the overall assembly height manageable for hood scoop fitment and carb clearance.
- 7.313-Inch Neck Flange: Large neck flange provides a stable mounting surface over the base filter assembly with positive retention.
- 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.
Fitment
| Fitment Status | Universal or dimensional product |
|---|---|
| Required Verification | Exact dimensions, media, connection, mounting interface, and companion part number |
Specifications
| Brand | K&N Engineering |
|---|---|
| Manufacturer Part Number | 66-3330R |
| Product Type | Air Filters - Universal Fit |
| Fitment Type | Universal |
| Condition | New |
What's Included
One new K&N air filters - universal fit identified by manufacturer part number 66-3330R. Hardware, adapters, clamps, hoses, filters, and service supplies are included only when stated for this exact product.
About K&N Engineering
K&N develops reusable air filtration, intake, oil filtration, fuel filtration, and related performance products for vehicle-specific and dimensional applications.
Related K&N Engineering Products
- Shop all K&N Engineering products
- K&N Filter Universal X Stream Clamp-On 2 3/4 inch Flange 6 inch Base 5 inch Top 6 1/2 inch Height
- K&N Filter Universal X Stream Clamp-On 2.438in Flange ID x 4.5in Base OD x 4in Top OD x 6.563in H
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Frequently Asked Questions
How do I confirm K&N 66-3330R fits my setup?
Match every listed dimension, flange or thread size, media type, mounting interface, and companion component. A similar shape or outside dimension alone does not confirm compatibility.
Is K&N 66-3330R washable and reusable?
Serviceability depends on the exact media used for this part number. Follow the K&N cleaning and oiling directions for this filter and never apply oil to media specified as dry.
What should be checked after installing K&N 66-3330R?
Verify seals, clamps, fasteners, hoses, sensors, wiring, and surrounding clearance as applicable. Check for leaks or contact, then follow the manufacturer service and reinspection schedule.
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.
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