Home > Auto performance > Air intakes and filters > Cold Air Intake Filter accessories > Item Number: AEM_20-403

Other products by AEMManufacturer Item #AEM_20-403
AEM bypass valve available in 2.5, 2.75, and 3 inches
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$57.29
$6.74 (12%)
$50.55
Usually ship out in 3 daysAEM air bypass valve
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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 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.
The bypass valve may cause a slight loss in power due to the interrupted wall section created by the internal shape of the valve. In dyno testing we have found that the power loss is minimal. The bypass valve offers great security against hydro locking the engine in rainy conditions. If maximum power is the requirement, we suggest that the bypass valve be used in the rainy season, and when racing use a coupler hose to make a smooth section where the bypass valve goes.

