★★★★★ 5
Great product
Size: CF10134&CA11476
Price great. Fit perfectly
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Reviewed in the United States on May 23, 2026
aFe MagnumFLOW Air Filters IAF P5R A/F P5R 4F x 6B x 4-3/4T x 9H
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
aFe MagnumFLOW Air Filters IAF P5R A/F P5R 4F x 6B x 4-3/4T x 9HSKU: 24 40035 UPC: 802959240144 aFe Power Magnum FLOW Universal Air Filter w Pro 5R Media 4 IN F x 6 IN B x 4 3 4 IN T x 9 IN H The aFe Power 24 40035 Magnum FLOW Pro 5R air filter delivers high airflow through five layers of oiled cotton gauze media for gains in horsepower and torque in any 4 inch clamp on intake system. This round conical universal filter measures 4 inches flange ID, 6 inches base diameter, 4 3 4 inches top diameter and 9 inches
Quick Dispatch:
Your aFe MagnumFLOW Air Filters IAF P5R A/F P5R 4F x 6B x 4-3/4T x 9H orders ship within 1-2 business days.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
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4.8 ★★★★★
Based on 858 reviews
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Product Reviews
★★★★★ 5
Perfect fit and high quality.
Size: (Pack of 1)
Good product, not much to say. The product arrived quickly, looks to be of high quality construction, fit perfectly and took me only a couple of minutes to install. I love it when a product is no frills and delivers as advertised. I've used various filters from K&N before and have always had very good success with them so I will be buying more of these for sure when the time comes.
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Reviewed in the United States on November 9, 2025
★★★★★ 5
Better than most.
Size: (Pack of 1)
Looks good, perfect fit.
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Reviewed in the United States on May 25, 2026
★★★★★ 5
Great Filter
Size: (Pack of 1)
This fits fine. Just wish it was a little easier to change.
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Reviewed in the United States on April 26, 2026
★★★★★ 5
More power, slightly lower (8%) MPG.
Size: (Pack of 1)
Installed on a 2.0 liter Subaru Impreza.
I drive up/down the I5 in california 3-4 times a year. For those that don't know there is about a 200 mile flat stretch where everyone runs at 75-85mph.
With various filters (FRAM, BOSCH, Subaru OEM), I would consistently get 29.8 mpg. Once I installed the K&N, I could feel the car pulling with a bit more power, but I noticed that I was getting about 27.5 mpg.
Totally worth it as the impreza is a little under powered and I don't drive many miles (6k/year) but if you are putting a lot of miles on your car, you may want to have more mpg.
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Reviewed in the United States on May 24, 2026
