Intake Bypass Stainless Steel Valve
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AEM Induction Intake Bypass Stainless Steel Valve

Part No. 20-403S Warranty Details  
Quantity  Add to Cart

Fit of this part varies by vehicle & equipment specs Type of Fit

AEM air bypass valves create a Vacuum leak to bypass the air filter in the event that the air filter sucks up water. Air bypass valves are typically installed onto the air intake tube on cold-air intake systems.

Product Features:
  • Fits 3 inch tubes
  • Secures with two included 1/2 inch wide hose clamps
  • Protects engine from water in cold-air intake systems
  • Installs along the upper portion of the inlet pipe
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by PowerReviews
AEM InductionIntake Bypass Stainless Steel Valve

(based on 1 review)

Ratings Distribution

  • 5 Stars



  • 4 Stars



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  • 1 Stars



Reviewed by 1 customer

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(3 of 7 customers found this review helpful)


S2000 aem bypass valve


from Florida

Verified Buyer
Helpful Reviewer


  • Lightweight
  • Versatile


  • Flimsy

Best Uses

  • Small Cars

Comments about AEM Induction Intake Bypass Stainless Steel Valve:

Somewhat difficult to make the two cuts on the pipe with a hacksaw. I recommend using a bandsaw for a smoother more even cut. Lining the valve up correctly was a little harder than I anticipated. Overall a part that's very important to use and will definitely keep water out of your engine and prolong the life of your motor.

  • Car & Truck:
  • Auto Enthusiast, Casual Driver

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Do you have questions about this product?


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1 Question | 1 Answer
Displaying question 1
  • Q:

    does this replace 1991 camaro rs stock air filter so u can attach a cold air or ram air in take
    Asked on 2/17/2015 by brandon from milford ct

    1 answer



      Hi Brandon, this part is not an exact fit for your 1991 Chevrolet Camaro RS. The exact intake bypass valve for your vehicle is currently unavailable online.

      Answered on 2/18/2015 by Steve from AAP
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