


K&N Round Tapered Universal Air Filter 4in Flange ID x 5.375 Base OD x 4in Top OD x 6.5in H
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
K&N Round Tapered Universal Air Filter 4in Flange ID x 5.375 Base OD x 4in Top OD x 6.5in HThe RP 4980 Universal Air Filter is constructed from an oiled cotton filter media. It comes with a K&N embossed carbon fiber top for strength and durability. The carbon fiber element adds to the light weight design and gives this filter a smooth glass like finish. The RP 4980 is a clamp on filter that has an inside flange diameter of 4 inches and a flange length of 5 8 inches. The base is 5 3 8 inches and the filter height is 6 1 2 inches. This Part
Quick Dispatch:
Your K&N Round Tapered Universal Air Filter 4in Flange ID x 5.375 Base OD x 4in Top OD x 6.5in H 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 Round Tapered Universal Air Filter 4in Flange ID x 5.375 Base OD x 4in Top OD x 6.5in H ships.
Need Help?
Questions about K&N Round Tapered Universal Air Filter 4in Flange ID x 5.375 Base OD x 4in Top OD x 6.5in H, sizing, or delivery? We're just an email away.
Live Shipping Estimates:
Enter your location at checkout to see available shipping methods and costs for K&N Round Tapered Universal Air Filter 4in Flange ID x 5.375 Base OD x 4in Top OD x 6.5in H in your area.
Get Shipping Estimates
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
You may also like
4.1 ★★★★★
Based on 769 reviews
Sort
Product Reviews
★★★★★ 5
Excellent product
Scent: Keratin
I have had frizzy hair all my life and once I went gray it became very much like my wire terrier’s hair! I have had keratin hair treatments but they are expensive. I use this keratin mask once or twice a week after shampoo and it works exceptionally well. I love the smooth silky texture of my hair. Well worth the price and it saves me money.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026
★★★★★ 4
Deep Conditioning Boost That Leaves Hair Softer
Scent: Keratin
I’ve been using the Keratin Hair Mask as a weekly treatment, and it has noticeably improved the overall feel and look of my hair. The mask has a rich, creamy texture that’s easy to apply and spreads smoothly through damp hair.
After leaving it on for the recommended time and rinsing, my hair felt softer and looked more hydrated. It helped reduce tangles and left my strands feeling smoother compared with regular conditioner alone. On days when I skipped styling products, my hair still looked healthier and less frizzy than before using the mask.
The scent is pleasant and not overpowering, and the mask rinses cleanly without any heavy residue. Over time, I noticed less dryness and a bit more shine, especially toward the ends where my hair tends to feel drier.
Pros:
Deep conditioning that improves softness
Helps reduce tangles and frizz
Pleasant, not overpowering scent
Rinses clean without residue
Cons:
Not a dramatic repair for severely damaged hair
Can feel heavy if left on too long
Overall:
This keratin hair mask is a solid choice if you’re looking for extra hydration and smoother texture between washes. It provides noticeable conditioning without weighing hair down and works well as part of a weekly hair care routine.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 29, 2026
★★★★★ 5
It keeps my hair looking great curly or straight
Scent: Keratin
I love this hair mask or conditioner. Not sure what it’s called. I know that I tried it a few years years ago and it really worked great with my thick curly hair. And it looks great when I blow dry it in my hair looks amazing shiny. I really like the product. I usually buy it every month, but I had suffered for a few months nothing wrong with the product. I just like to try all types of products I put in my hair whenever is out there new or old I will try it like I said my hair curly not very curly but enough that I need strong, thick conditioner I don’t like the I usually say my hair is damaged and that way I get the thick shampoo and conditioners thank you.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 24, 2026
★★★★★ 5
HEALTHY HAIR
Scent: Keratin
It makes my hair feel, soft, manageable, non frizzy, healthy. Shiny, curl definition.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
★★★★★ 3
That it works
Scent: Damaged Hair
I just tried it i can't commend until I keep using it but my hair feels softer
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 5, 2026