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The K&N E-3671 oval air filter measures 12 inches long 5-1/4 inches wide and 3-1/4 inches tall with a 1.75 inch ID x 2.5 inch OD centered flange that is 1.125 inches high. This universal high-flow filter installs in custom air intake systems and compatible factory air boxes on cars trucks ATVs and UTVs. It improves engine performance by increasing airflow while protecting against contaminants using layered oiled cotton gauze media.
Key Features
- Increased Horsepower: High-flow design forces more air into the engine for added power output.
- Universal design for custom intakes and factory air boxes matching 12in L x 5-1/4in W x 3-1/4in H with 1.75in ID flange check your setup dimensions.
- Layered oiled cotton gauze media provides high flow and dirt-holding capacity re-oil with K&N oil after washing.
- Dyno-tested for real-world horsepower gains.
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 | E-3671 |
| 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 E-3671. 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 Universal Oval Clamp-On Air Filter 2-3/4in Flange 6-1/4in Length 4in Width 5in Height
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Frequently Asked Questions
How do I confirm K&N E-3671 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 E-3671 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 E-3671?
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
- Verify flange dimensions match intake tube before install
- Compatible with rubber top mount and flexible frame design
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