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Old 09-10-2002, 04:06 PM   #1
Scooby Newbie
Member#: 23062
Join Date: Aug 2002
Location: Waltham, MA
2002 Impreza WRX

Default AEM Cold Air Intake and Air Bypass Valve

i am considering upgrading my stock '02 WRX intake. However i was worried taking in water. I live in Mass and when it rains here, which is not that often, it really comes down. When i saw the AEM cold air intake with the air bypass valve it looked like a god send. However when i went to look up the part number it was listed as N/A. Does anyone know if there is an air bypass for the AEM cold air intake for the '02 WRX? If there isn't, like i suspect does anyone know when AEM plans on releasing it?

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jfalcon001 is offline   Reply With Quote
Old 09-10-2002, 05:01 PM   #2
Scooby Newbie
Member#: 21704
Join Date: Jul 2002
Location: Bentonville, AR
Sold my WRX
8/21/2009 :'(


I have the AEM CAI (love it!), not sure, but I think the reason that you can't use the bypass valve is because there isn't room enough for it. It's a tight fit as it is, and with the extra 2" or so that the valve would add, I think the intake piping would run into the outside fender. The instructions that come with the CAI specifically tell you *not* to use the bypass valve. Hope this helps.
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Old 09-10-2002, 05:06 PM   #3
Scooby Specialist
Member#: 12434
Join Date: Nov 2001
Chapter/Region: Tri-State
Location: PA
2002 WRX, 2015 WRX
2011 BMW 135i


From what I have heard its not the room thats a problem.....it is the turbo sucking the valve open when it shouldnt be. Oh yeah....it sucks too...I had one on my N/A Eclipse and the valve broke in half and almost sucked the foam inside the throttle body...that has supposedly been fixed though. I wouldnt worry to much about water though...i think that subject is way over rated. Im on my second car with a CAI and have had 0 problems. Hell, I removed the piece on my bumper in my Eclipse and when it was raining the filter would be in direct contact with the rain. You would really have to drive in some deep water to suck that much in.
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Old 09-10-2002, 05:07 PM   #4
Scooby Specialist
Member#: 16495
Join Date: Mar 2002
Chapter/Region: South East
Location: Jacksonville
2013 BRZ
Sterling Silver Metallic


Search here in FFI for the words AEM & bypass.

The foam coating on the valve has been know to get SUCKED into the piping and then foul out the turbo.

If you're living in a high water area, consider a short ram/pod filter for more piece of mind. Hydro lock is a VERY expensive lesson.

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Old 09-10-2002, 05:17 PM   #5
Scooby Newbie
Member#: 23062
Join Date: Aug 2002
Location: Waltham, MA
2002 Impreza WRX


The problem with the bypass breaking up and being sucked into the turbo and clogging the throtal body housing has been fix. So that is no longer a concern... Why wouldn't AEM just shorten the pipe by two inches if the it was a little big that way the bypass would work. Something tells me that there has to be a better reason than room. The turbo sucking it open when it shouldn't be seems more likely.
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Old 09-10-2002, 07:45 PM   #6
Scooby Specialist
Member#: 14970
Join Date: Feb 2002
Chapter/Region: BAIC
Location: San Jose, CA
1997 GF8


I heard on www.subarureviews.com that the AEM actually decreases HP and Torque. I have an Injen Race Div. and its a great performer, but I hate that BOV sound EVERY time I shift. It gets annoying. Air Intakes increase HP by leaning out the air/fuel ratio. Just do a pannel filter until you upgrade your ECU.

About the Air Bypass thing, They sound like they work, but I woudn't trust one to not take in any water.


P.S. Any intake with a tube size of 2.5" 2.75" or 3.0" can get a bypass valve spliced into it, from what I read on www.injen.com
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