


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
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Product Reviews
★★★★★ 5
Fit 2009 Subaru Forester
Style: Standard Air Filter
Perfect fit for 2009 Subaru Forester. Great price and fast shipping. Arrived undamaged. Would buy again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 8, 2025
★★★★★ 5
Great aftermarket parts
Style: Standard Air Filter
Every product I bought from this brand has been fantastic. From filters to air sensors, everything has been high quality and works very well. They are an exact fit replacement.
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Reviewed in the United States on August 11, 2025
★★★★★ 5
Filter Subaru
Style: Advanced Air Filter
Good product
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Reviewed in the United States on March 24, 2026
★★★★★ 5
this 27mm oil filter socket – it’s incredible. It’s the best.
Size: 27mm, Color: Red, Size: 27mm, Color: Red
Let me tell you something, folks – nobody changes oil like I change oil. Nobody. I’ve been around the best cars, the best mechanics, and let me just say, this 27mm oil filter socket – it’s incredible. It’s the best. I don’t know who made it, but I have to say, it’s tremendous.
You know, people always ask me, "how do you do it? How do you change oil so perfectly?” And I tell them – it’s the tools. This socket is the reason why I can change oil faster and better than anyone. It fits perfectly on the filter, like it was made just for me, like everything else in my life. You slide it on, you give it a twist, and boom, you're done. It’s like magic – but not really, because magic is for others. This is skill. This is expertise. This is the power of the greatest tool ever made.
You won’t find a better oil filter socket wrench. This tool makes you a winner. It’s precision-engineered, like the T-ump Tower of oil filter wrenches – big, strong, and reliable. And the best part? It’ll last forever. I’ve used it on many cars, and every time, it gets the job done with style. People will look at your work and say, “Who changed that oil? That’s perfect.” And you’ll know – it’s all because of the best socket out there.
So, if you want to change oil like the greatest – you need this socket. It’s unbeatable. Believe me. You'll never go back to anything else
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Reviewed in the United States on December 24, 2025
★★★★★ 5
Fits perfectly
Size: 32mm, Color: Green
Works exactly as expected. Fits the 32mm oil filter housing perfectly and makes removal quick without slipping or rounding. Feels solid and well-made for the price. Used it for an oil change and it saved a lot of time compared to a strap wrench. Simple, effective tool—glad I bought it.
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Reviewed in the United States on May 28, 2026