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AEM

AEM 20-403S 3" Air Bypass Valve

  • Based on 61 reviews
Condition: New
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$71.99 Why this price?
Holiday Deal · 10% off was $79.98

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Availability: Only 1 left in stock, order soon!
Fulfilled by WunderCarParts

Arrives Dec 26 – Dec 31
Order within 20 hours and 46 minutes
Available payment plans shown during checkout

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 AEM Electronics website.

Description

AEM produces a variety of accessories and miscellaneous parts.


Material: Nylon


Brand: AEM


Item Dimensions LxWxH: 6.1 x 6.3 x 3.8 inches


Exterior Finish: Painted


Valve Type: Air bypass valve


Manufacturer: ‎AEM


Brand: ‎AEM


Model: ‎AEM 20-403S


Item Weight: ‎8 ounces


Product Dimensions: ‎6.1 x 6.3 x 3.8 inches


Item model number: ‎20-403S


Is Discontinued By Manufacturer: ‎No


Exterior: ‎Painted


Manufacturer Part Number: ‎20-403S


OEM Part Number: ‎20-403S


Voltage: ‎12 Volts


Date First Available: November 23, 2005


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Dec 26 – Dec 31

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • five stars
It fit, it works, relatively easy to install if you know what you're doing.
Reviewed in the United States on March 30, 2021 by C. Edgar Nolan and Ellie

  • Perfect safety valve for a cold-air intake
I call it a "safety" valve because if you ever installed a cold-air intake, one of your fears is if the intake sucks up water from a puddle when driving (your engine may be toast). If your filter does get wet from a puddle, the bypass valve would open up to allow fresh air to be sucked in by the engine rather than the water. Good idea. Just can't be used on any engine with forced induction. ... show more
Reviewed in the United States on March 6, 2012 by Stanward S. M. Oshiro

  • Great precaution
Fits well on a33 on injen full cold air intake midway inbetween before maf
Reviewed in the United States on October 11, 2020 by Maxed out

  • Best replacement of OEM NISMO part.
Overall I'm happy with the pricing and the performance of the part when used in my NISMO cold air intake system as it really is the only option i've found that fits my application. Be aware that this is the 3rd one in 8 years as the mounting flanges tend to break off from flexing.
Reviewed in the United States on December 12, 2012 by FirestormFX

  • :)
Just what I needed!
Reviewed in the United States on June 30, 2020 by Richard Tyler

  • Perfect
Excellent quality, like the one that came with my intake. I had to swap out with the original one after 7 years of use. Be cafeful not to touch the foam, it's fragile.
Reviewed in the United States on October 13, 2015 by Dustin

  • Excellent
Excellent
Reviewed in the United States on June 22, 2020 by Amazon Customer

  • Perfect replacement
Purchased this as a replacement for my Nismo cold air intake on my 2005 Sentra SE-R. Fit was perfect, and no problems installing. Cost was about half of the Nismo model. No complaints here!
Reviewed in the United States on May 2, 2014 by Jared S.

  • A
A
Reviewed in the United States on November 14, 2019 by timothy huff

  • Perfect replacement for a 15 year old unit!
Perfect replacement for a 15 year old unit! Easy install....
Reviewed in the United States on February 15, 2018 by H. Howard

  • awesome
my intake is by DC Sports all I had to do was cut the tube and this fit right on. it shipped fast and got here ahead of schedule
Reviewed in the United States on February 7, 2013 by jared

  • Five Stars
If you are using AEM intakes you should buy one of these, take care of your car.
Reviewed in the United States on June 3, 2016 by Not your average joe

  • Five Stars
Haven't had any issues good fit no hassle , arrived on time
Reviewed in the United States on February 16, 2017 by MARTIN

  • Cannot adapt to any shock, breaks and leaks almost ...
Cannot adapt to any shock, breaks and leaks almost instantaneously. Plan to shorten the intake from the front end closer to the tboby for no worries of alternative intake.
Reviewed in the United States on November 2, 2015 by Mike Christensen

  • Good Call
I needed to replace a 5 year old bypass filter I first installed. It made a big difference. Packaging was well and everything seems good.
Reviewed in the United States on February 19, 2013 by Ken

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