


K&N Custom Round Filter 5-1/8in FLG / 9in OD x 4-1/8in HW/VENT
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
K&N Custom Round Filter 5-1/8in FLG / 9in OD x 4-1/8in HW/VENTK&N's custom air cleaner assemblies are designed with the racer in mind. They incorporate good looks as well as the superior air flow that you expect from K&N. These custom air cleaner assemblies are designed for use with any engine that uses a round element air cleaner housing. They incorporate our famous K&N Air Filters and provide more air flow than other assemblies of this type. Available in 4 different designs, the perfect assembly is sure to be
Quick Dispatch:
Your K&N Custom Round Filter 5-1/8in FLG / 9in OD x 4-1/8in HW/VENT orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
Order Tracking:
You'll receive a tracking link by email once your K&N Custom Round Filter 5-1/8in FLG / 9in OD x 4-1/8in HW/VENT ships.
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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]
- Please click here for more details>>> Return & Exchange Policy
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4.8 ★★★★★
Based on 1201 reviews
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Product Reviews
★★★★★ 5
Cumplió mis expectativas
Size: 54 mm, Color: Brown/Grey/Brown Gradient
Hermosas y de buena calidad
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 26, 2025
★★★★★ 2
Missing “C’s” on temple
Size: One Size, Color: Cd472 Black Grey Gradient
Material felt cheap and were missing the “C’s” on both sides of the temples.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2025
★★★★★ 5
Beautiful
Size: 54 mm, Color: Brown/Grey/Brown Gradient
Beautiful. I love them so much. I wear them all of the time.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
★★★★★ 5
Cumplió mis expectativas
Size: 54 mm, Color: Brown/Grey/Brown Gradient
Hermosas y de buena calidad
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 26, 2025
★★★★★ 2
Missing “C’s” on temple
Size: One Size, Color: Cd472 Black Grey Gradient
Material felt cheap and were missing the “C’s” on both sides of the temples.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2025
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