


K&N Universal Custom Air Filter - Oval Shape 9.313in OD / 2.375 Height
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
K&N Universal Custom Air Filter - Oval Shape 9.313in OD / 2.375 HeightSKU: E 3988 UPC: 024844366818 K&N Universal Custom Air Filter Oval Shape 9. 313in OD 2. 375 Height for Harley Davidson Sportster 2004 2022 K&N E 3988 is a washable reusable oval air filter designed as a direct replacement for RK Series air cleaner assemblies on Harley Davidson Sportster motorcycles from 2004 to 2022. This high flow filter increases horsepower and acceleration by allowing greater airflow while maintaining strong filtration to protect
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Your K&N Universal Custom Air Filter - Oval Shape 9.313in OD / 2.375 Height orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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4.1 ★★★★★
Based on 342 reviews
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Product Reviews
★★★★★ 5
Perfect fit
Great quality filters, both fit snug
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
★★★★★ 5
Great price
2018 Honda Civic EXL Turbo great fit, great price!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 15, 2026
★★★★★ 4
Good fit.
Good fit.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 29, 2025
★★★★★ 5
Great product!
I have a 2022 CRV and these filters are great quality, they fit perfectly and are better than the factory brand with a much better price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 4, 2026
★★★★★ 5
Price and quality.
Perfect! Saves you money over dealership! Simple to install! Quick and easy!
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Reviewed in the United States on January 18, 2026
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