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AEM Air Bypass Valve Part #20-401S Customer Reviews

Average Rating

12 Customer Reviews

American Made Quality

Reviewed by Elijah R (Eugene, OR) — Apr 17, 2012 11:40 PM

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1 of 1 people found the following review helpful.

I am very Impressed with the speed in which i got my valve and while You can find cheaper you cant find better! Installed on 2.0L DOHC ZeTec. Item was received as described. "A+"

AEM Air Bypass Valve

Reviewed by Julio C (Lincoln, CA) Reviewed for a 1994 Acura Integra — Oct 22, 2009 7:01 PM

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4 of 7 people found the following review helpful.

Product gives me a little bit more confidence when driving in the rain. Very easy to install I used a hack saw to cut my cold air intake then added the bypass valve with ease! I did notice that my intake is'nt as loud as it was without but I didnt feel any power loss.

AEM sir bypass valve

Reviewed by Shawn P (Gresham, OR) Reviewed for a 2005 Mazda 3 — Mar 05, 2009 12:41 PM

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6 of 8 people found the following review helpful.

I live in Gresham Oregon where it rains quite a bit, i would definitly recommend as an insurance policy to your cold air intake. So far no complaints and valve doesnt affect proformance on my intake.

Save your engine

Reviewed by Aaron L (Lake Dallas, TX) Reviewed for a 1993 Honda Civic — Oct 29, 2008 6:05 AM

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11 of 15 people found the following review helpful.

The bypass valve is key to saving your engine from water damage. The only problem is it breaks every year from vibrations and normal wear and tear but other than that it does its job keeping water out of my engine.

Need better illustrated instructions

Reviewed by Michael S (Groveland, FL) Reviewed for a 2002 Honda Accord — Jan 23, 2008 11:45 AM

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2 of 7 people found the following review helpful.

I had to look online to find what the bypass valve looked like after instillation. It was easy to install but I didn't use the instructions that much in the installation.

Btpass Valve

Reviewed by Michael C (Hanover, PA) Reviewed for a 2001 Ford Focus — Jan 23, 2008 4:54 AM

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3 of 4 people found the following review helpful.

I got my bypass valve and installed it very easy. I only wish they would make the pipe out of the same material as the intake. My old one cracked throwing the idle off because it was before the mass air flow sensor, thus allowing more air to come in, usually not a bad thing, but threw the idle off. Everthing else is good, just use metal instead of plastic.

A must have with an Air Intake

Reviewed by Richard H (Danbury, CT) Reviewed for a 1998 Honda Accord — Dec 19, 2007 4:20 AM

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1 of 3 people found the following review helpful.

You must buy this if you don't want to do some major damage done to your engine. A great product for a very cheap price.

AEM Air Bypass Valve

Reviewed by Nareth V (Concord, NH) Reviewed for a 1999 Honda Accord — Jul 14, 2007 7:23 PM

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2 of 3 people found the following review helpful.

Definitely a must have for rainy weather. The instructions were sort of unclear where to cut the intake. Had to go the AEM's website find out exactly where to cut the intake.

Easy install and worth saving your engine

Reviewed by Mike E (Placentia, CA) Reviewed for a 2000 Acura Integra — May 09, 2007 8:42 PM

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1 of 1 people found the following review helpful.

It took me 5 minutes to chop my intake in two with the sawz-all and file down the edges, and throw it back together. I live in SoCal and don't get a whole lot of rain, but when it does rain, or i go on a road trip, i would hate to have the possibility of wrecking my engine on my mind. Under $50 to give me peace of mind? SOLD

Works great

Reviewed by Paul D (Smithtown, NY) — Apr 05, 2007 10:21 PM

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0 of 1 people found the following review helpful.

Easy fit! Easy to install! Fast shipping A++++

AEM Air Bypass Valve - 20-401S

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Options

  • Part Size:
    2.50" Inlet
  • Part #:
    20-401S
  • 2.50" valve inlet (fits intake pipes with a 2.50" outlet diameter)
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