


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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4.7 ★★★★★
Based on 1483 reviews
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Product Reviews
★★★★★ 5
get it
Size: 2.0L
get it! i have a honda civic and i have bought this 3 times. works great!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 25, 2026
★★★★★ 4
Worth buying again.
Size: 2.0L
Works great. Right fit. Great value
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 2, 2026
★★★★★ 5
Great quality
Size: 2.0L
Perfect fit! Will definitely purchase it again
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 12, 2025
★★★★★ 5
Works great on my 2018 Honda Civic EX
Size: 2.0L, Size: 2.0L
Been buying these for years. They are relatively cheap and easy to replace, so much better than getting ripped off at the dealer lmao.
Compatibility and Installation - 5/5
Filtration Efficiency and Performance - 5/5
Durability and Value for Money - 4/5 - these are made to be replaced, so can't really do much about that!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2024
★★★★★ 5
Perfect
Size: 2.0L
I bought this and was able to change this myself. It was simple. I got this for my 2016 Honda Civic, I don't think I ever replaced the filter in my car in the 5 years that I had it. It had a distinct smell in my car, and once I popped this bad boy in, within a day or two the smell was gone. It did make a sound for a while like I did not do it correctly, but I did, after about a week the sound went away, so everything's good. I will buy this again when the time comes
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Reviewed in the United States on July 16, 2024
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