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Old 06-07-2013, 04:32 PM   #1
Scooby Specialist
Member Sales Rating: (2)
Member#: 329252
Join Date: Aug 2012
2012 Subaru WRX

Default AEM Dryflow for stock air box

Recently picked this up because I've literally heard nothing but positives about this filter on various applications. My first thought when taking it out of the box was "wow, this feel and looks high quality)".

Figment was absolutely perfect. It's very snug and the rubber surrounding seals everything shut around the outside. I'm not going to lie and say I felt a power or noise difference, because I didn't, but when I did a virtual dyno using my datalog info, I was a few lbs higher on the torque side. This can be from anything though really, as the virtual dyno is never exactly the same with different pulls.

Now, gas mileage is where I noticed the biggest difference. Keep in mind I fill up at the EXACT gas station always and always take the same drive from there to work (city driving). I reset my trip odometer after fill up and immediately noticed how quick the mpgs were rising. Now...I know they fluctuate a lot during the first few miles after you reset the odometer, but I always pay VERY close attention to it after a fill up.

Previously with my old air filters, I would always have trouble breaking 20mpgs in the first few miles of city driving. It would always be around 14 and then slowly build up to 18-19. With my aem, it shot up to around 24 with the exact same driving habits and route as usual, and after 20 miles of city driving I'm sitting at 23.6mpgs. This is not even because of a clean filter...when I changed my filter before to a Napa gold filter, it was the same as always. The aem must flow a lot better.

I'll be doing an oil analysis in a couple thousand miles to see if it's filtering good too, but from tests I've seen on bobistheoilguy, it seems to have above average filtration too.

The filter is worth it alone for the fact that you can clean it over and over. The mpg boost is a bonus.
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Old 06-10-2013, 12:34 AM   #2
Scooby Specialist
Member Sales Rating: (46)
Member#: 147328
Join Date: Apr 2007
Chapter/Region: South East
Location: Fort Lauderdale, FL
2007 WRX


edit: cleaned it up..

I want to subscribe to see how your oil analysis compares. Thanks for the review.

Last edited by flimflamman; 06-10-2013 at 12:56 AM.
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Old 06-27-2013, 05:16 PM   #3
Scooby Specialist
Member Sales Rating: (2)
Member#: 329252
Join Date: Aug 2012
2012 Subaru WRX


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Old 05-18-2015, 09:48 PM   #4
Scooby Newbie
Member Sales Rating: (1)
Member#: 307624
Join Date: Jan 2012
Chapter/Region: MWSOC
Location: Des Plaines, IL.
2008 WRX Hatch
325/347, 380XT, 8 cm2


I have a big problem with my AEM (K&N) DryFlow panel filter!

I have switched from K&N oiled one to AEM DryFlow about 4 months ago.
I cleaned the air box with alcohol, and MAF with CRC MAF cleaner at the same time.

After a month, noticed on my AP that my LTFTs were negative which hadn't ever happened before since my pro-tune two years ago. Gradually, over the next couple months, LTFTs became more and more negative.

Once they reached -18% I started investigating:
- A car doesn't take any oil (never had),
- No smoke from the exhaust,
- No smoke from the oil filler neck,
- Installed Crawford AOS - so its not PCV valve,
- No pre- front O2 sensor exhaust leaks (had to remove wrap),
- Installed new front O2 sensor,

Finally, I ordered a new MAF sensor, after one of the members here had identical symptoms (large negative LTFT) and fixed it with a new MAF.

In the meantime, I haven't even considered cleaning the MAF since it was cleaned just four months ago and now I have DryFlow filter!!!

But being desparate, I decided to clean it, hoping for it to get at least a bit better while waiting for a new one. Of course, I didn't have MAF cleaner (because now I have AEM DryFlow filter!!!) so I just soaked it for 15 min. in isopropyl alcohol. There'was no dust or sticky residue inside the air box.

Today morning, I reset ECU, started a car, and started driving before my LTFT become too negative. To my surprise, they actually started climbing up!
Now they are in the +1 to +7 range, which hasn't happened for the past two months.

I tried to find somebody else who had a problem with AEM DryFlow filter rather than masturbate to it and I found this blog:


Apparently, dust from the AEM filter attaches itself to the sensor.

So Good Bye AEM piece of $#@t!

Going back to K&N oiled filter which I had used on my car for 5 years before, never having problems with clogged MAF.

Last edited by kaczmarz; 05-19-2015 at 08:39 PM.
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