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Green Air Filters Part #2421 Customer Reviews

Had to trim seal to fit!

Reviewed by TONY S (GLADSTONE, MI) Reviewed for a 2006 Subaru Forester — Apr 22, 2016 4:57 AM

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Wouldn't fit in my airbox, had to trim the seal to make it fit-

2011 Subie Forester Green filter

Reviewed by Albert C (FAIRFIELD, CA) Reviewed for a 2011 Subaru Forester — Jan 30, 2016 8:40 PM

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I used to have a K&N installed but the service people at the dealer tricked her into replacing it with a stock filter. I'll see how the green filter traps dirt in comparison to the K&N.

Subaru WRX Air Filter Install

Reviewed by Richard Y (LOMPOC, CA) Reviewed for a 2013 Subaru Forester — Oct 27, 2015 5:41 PM

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Its not really the fault of the air filter so much as it is the WRX design. There is very little room in there, and I ended up having to take the whole intake manifold apart to get it installed. The filter itself didn't want to click right in, and it took some wiggling/force to get it all back together. I am still not happy with how it closed. I am taking the car in for service soon, and I am going to ask them to have a go at it. Good luck dealer...

Loud whistle

Reviewed by Dion J (Santa Cruz, CA) Reviewed for a 2011 Toyota Tundra — Oct 11, 2014 7:46 AM

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1 of 1 people found the following review helpful.

Like the filter, think it's well made, but the whistle I'm getting at part throttle is driving me crazy. I'll probably replace it with a paper filter.

Green air filters for Subaru B9 Tribeca

Reviewed by chung l (Elmhurst, NY) — Apr 21, 2009 5:10 PM

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1 of 2 people found the following review helpful.

Excellent quality and performance; save gasoline and increase power. When I installed this filter to my car, I spent more than an hour and still could not put back the cover tightly. I found out the radius of upper two corners are small than the cover inside the car (original shape of Green air filter is close to rectangular). Finally, I did a little cut and sleek the corners to fit for the cover.

Green Air Filters - 2421

  • $25.55 - $115.31
    • On Sale: 15% Off
  • $21.72 - $98.01
  • Free Shipping
  • Ships Between 1/25 - 1/27
  • What Do You Drive?


  • Style:
    Flat-Panel Filter
  • Part #:
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