★★★★★ 5
Very cold
Color: 01 - Light Grey
Super cold
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 25, 2026
K&N Replacement Element for RK-3929 Custom Air Filter
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
K&N Replacement Element for RK-3929 Custom Air FilterSKU: E 3040 UPC: 024844199348 K&N E 3040 Replacement Element for RK 3929 Custom Air Filter Fits 2004 2021 Harley Davidson Sportster The K&N E 3040 is a washable reusable oval air filter that replaces the element in RK 3929 custom air cleaner assemblies on select 2004 2021 Harley Davidson Sportster models. It delivers higher airflow for gains in horsepower and acceleration while protecting your engine with four layer cotton gauze filtration. Covered by
Quick Dispatch:
Your K&N Replacement Element for RK-3929 Custom Air Filter 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 Replacement Element for RK-3929 Custom Air Filter ships.
Need Help?
Questions about K&N Replacement Element for RK-3929 Custom Air Filter, 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 Replacement Element for RK-3929 Custom Air Filter 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
K&N 11-13 Audi A6 0L L4 Replacement Air Filter
55.19
K&N 12 Can-Am Outlander 800R EFI 800 Replacement Air Filter
55.19
K&N 07-12 Ducati 1098/1098S/1098R/848 848/1198S/Streetfighter/848 Evo/Diavel Replacement Air Filter
67.19
K&N 91-00 Rover Mini L4-1.3L Replacement Drop In Air Filter
68.99
K&N Custom Air Filter - Rectangular - 6.75in O/S Length x 4.5in O/S Width x 2.5in Height
68.99
K&N Replacement Drop In Air Filter - 14in OD / 12in ID / 4in H w/ Wire
83.99
K&N 15-18 Audi A4 L4-1.4L 18-20 A5/RS5 2021 Q5 F/I Drop In Replacement Air Filter
67.19
4.1 ★★★★★
Based on 1744 reviews
Sort
Product Reviews
★★★★★ 5
Cool pillow vase
Color: 01 - Light Grey
Nice cool material and stays kn the pillow well due to the snaps.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 21, 2026
★★★★★ 3
Ugly
Color: 01 - Light Grey
The light blue color looks like a hospital gown. Keeps cool but I don't think I can bear looking at it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 9, 2026
★★★★★ 5
Cooling pillowcase
Color: 01 - Light Grey
These cooling pillowcases are fabulous. I just have one complaint they snap at the end instead of having a zipper, which could be uncomfortable if you’re laying on that snap. Also, it’s very hard to unfasten.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 5, 2025
★★★★★ 5
Comfy and cooling pillow cases for sleeping
Color: 01 - Light Grey, Color: 01 - Light Grey
Cooling cover for my pillow, great quality and super soft. Helps with my sleep. Have eye mask as a gift too. Highly recommended.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 28, 2025
