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AEM

AEM 20-401S 2.5" Air Bypass Valve

    • Based on 14 reviews
Condition: New
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$75.65 Why this price?
Save $4.33 was $79.98

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Availability: Only 3 left in stock, order soon!
Fulfilled by Amazon
Arrives Monday, Sep 23
Order within 3 hours and 18 minutes
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Features

  • Virtually eliminates chance of intake system ingesting water if filter becomes submerged
  • Installs along upper portion of AEM intake systems with minor modifications
  • Patent #6,394,128
  • Complete hardware and installation instructions included
  • For a cross reference chart to see which Bypass Valve fits your Cold Air Intake System please visit aempower website.

Description

AEM produces a variety of accessories and miscellaneous parts.


Brand: AEM


Item Dimensions LxWxH: 6.1 x 6.3 x 3.7 inches


Exterior Finish: Painted


Manufacturer: ‎AEM


Brand: ‎AEM


Model: ‎AEM 20-401S


Item Weight: ‎8 ounces


Product Dimensions: ‎6.1 x 6.3 x 3.7 inches


Country of Origin: ‎USA


Item model number: ‎20-401S


Is Discontinued By Manufacturer: ‎No


Exterior: ‎Painted


Manufacturer Part Number: ‎20-401S


OEM Part Number: ‎20-401S


Voltage: ‎12 Volts


Domestic Shipping: Item can be shipped within U.S.


Date First Available: June 20, 2006


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Sep 23

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Fragile to say the least
I purchased this product for my AEM Cold Air Intake system to elmiminate the chance of hydrolock, a condition that occurs when your engine ingests water, which cannot be compressed like air, causing damage to your piston rods. Unfortunately my order arrived damaged, with a small tear in the foam housing of the valve so I did not have a chance to install it. I would like to give a few tips to check before purchasing this product though. First off, this valve is large it is about 2 times the size of your intake pipe and cannot touch anything after it is installed, so make sure you have the clearance around the pipe to ensure that it will fit. Secondly you will have to cut a section of your intake pipe, or have someone else do it, either way you probably don't want to purchase this if you are not comfortable with making this modification. Although I had problems with my product I am in no way suggesting that you will. The damage to mine was in shipping, not bad manufacturing and I would like to recommend this as a worthy addition to the Cold Air Intake System. ... show more
Reviewed in the United States on May 29, 2009 by F. Lambert
    • Good insurance for your engine.
Seems very well made like all AEM products, not the easiest install because you need to remove the air intake and cut out a section to fit the bypass valve. Make sure you install your CAI first to find the right spot to fit this, also make sure to remove all the shavings good from cutting the pipe if not all that crap goes in your engine and will be detremental to the engine. I do not know if it works yet and hope I don't need to test it but its good insurance just in case. I have mine installed on an 03 Accord i4 w/ 2" drop and an AEM CAI, I installed the valve on the pipe behind the battery, fits good, looks good. ... show more
Reviewed in the United States on October 4, 2009 by Doug S
    • Four Stars
Using this will keep the water out of engine and it still get air to run
Reviewed in the United States on September 18, 2014 by George H.
    • Failed
I thought this would be great for my cold air intake. After 1 or 2 years the rubber ripped apart and my engine was now sucking in non filtered air...
Reviewed in the United States on January 3, 2014 by Jeremiah J. Guinta
    • but it was just as good as new
Purchased used, but it was just as good as new.
Reviewed in the United States on June 18, 2015 by agentzero
    • Perfect match for my Honda
Perfect match for my Honda. The old one was coming apart
Reviewed in the United States on September 4, 2014 by Don

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