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AEM 20 403S Air Bypass Valve Review

3

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Average

Revainrating 3.5 out of 5  
Rating 
3.3
🔧 Emission System, 🏎️ Performance Car Parts & Accessories

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Details

BrandAEM
Item Dimensions LxWxH6.1 x 6.3 x 3.8 inches
ExteriorMachined

Description of AEM 20 403S Air Bypass Valve

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.

Reviews

Global ratings 3
  • 5
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  • 4
    1
  • 3
    1
  • 2
    1
  • 1
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Type of review

Revainrating 4 out of 5

Boosted Emissions Control: AEM Valve

As a result of using this valve, I found that my car's emissions were much cleaner, and my engine ran more smoothly. The installation was also simple and easy. The only downside is that it may not be compatible with all car models.

Pros
  • Improved emissions control and engine performance
Cons
  • Not compatible with all car models.

Revainrating 2 out of 5

Cannot conform to almost all bumps, cracks and leaks.

Cannot adapt to shock, breaks and leaks almost immediately. Plan to trim the air intake closer to the body from the front so you don't have to worry about an alternate intake.

Pros
  • To see which bypass valve is right for your cold air intake system, visit the AEM Electronics website.
Cons
  • Operating speed

Revainrating 3 out of 5

Best replacement NISMO OEM part.

Overall I am happy with the price and performance of this part when used on my NISMO cold air intake system as it is the only one that I have found will work for my application. Keep in mind this is the 3rd time in 8 years as the mounting flanges tend to break when flexed.

Pros
  • Patent #6,394,128
Cons
  • Problems