AEM 20-401S 2.5" Air Bypass Valve

The AEM Air Bypass Valve for Cold Air Induction Systems virtually eliminates the unlikely chance of water ingestion should the filter element become wet from deep puddles, rain, hail, sleet or snow–or any other scenario in which the filter element could encounter or become submerged in water. The valve installs along the upper portion of the inlet pipe on the same axis as the throttle body centerline. Should a drop in pressure occur within the pipe due to filter submersion, the valve shuts down induction at the filter and routes incoming air through its external orifices, eliminating any chance of water ingestion. AEM’s Air Bypass Valve is for use on AEM Cold Air Systems only. The AEM Bypass Valve is used to protect the engine from hydro locking. Hydro locking occurs when the end of the inlet pipe is submerged in water and the water is sucked into the engine. Driving the vehicle in rainy conditions is not enough to cause a problem unless the vehicle becomes submerged enough that the inlet end of the pipe is immersed in water. Rain impingement on the filter will not cause a hydro lock condition. The distance of the filter from the road dictates the level of water that can cause damage. This distance varies with the vehicle ride height which is why there are no published numbers for this measurement. All AEM Cold Air Intakes are to be used with the splash shield that is originally installed on the vehicle for protection and performance. The removal of splash shields actually deteriorates performance by allowing hot pavement air in the vicinity of the filter and negates any positive pressure created in the air filter area when the vehicle is in motion. There are some instances where there is not enough room around the inlet pipe for adequate clearance of the Bypass Valve. In these cases a Short Ram system is offered or will be offered in the near future.

This is a universal product and is not guaranteed to fit all vehicles. Recommended for use with AEM Cold Air Intake Systems, but MAY work with other brands.