Air ByPass Valve Installation Instructions: 20-400s, 20-401s, 20-402s & 20-403s
The AEM air bypass valve is ONLY compatible with genuine AEM intake systems. You must ensure that the valve is installed in the correct location for your vehicle and that the rubber soft mount that was originally supplied with the AEM intake is properly installed. The structural integrity of the valve depends on correct installation. Use of the AEM Air Bypass Valve in conjunction with any other system is neither recommended nor warranted and may result in, among other things, malfunction of the AEM Air Bypass Valve.
The AEM Air Bypass Valve is NOT TO BE USED ON TURBO or SUPERCHARGED engines. Use of the AEM bypass valve on engines with these modifications, will void any warranty of the valve and reduce the performance of the vehicle. The AEM Air Bypass Valve can be used in nitrous applications where the fogger nozzle is installed in the intake pipe only when the nozzle is installed in between the bypass valve and the throttle body.
AEM has developed an Air Bypass Valve for its Cold Air Induction Systems. This valve installs on the intake pipe along the same axis as the throttle body and eliminates the chance of water ingestion should the filter element become wet from rain, hail, sleet, snow, flood or any other scenario where the filter element could encounter or become completely submerged in water. The Air Bypass Valve is designed to open when the filter element becomes completely submerged in water thereby preventing terminal engine damage. The Air Bypass Valve is available in three sizes to fit every AEM intake system diameter. It’s crafted from mineral reinforced polycarbonate, which has outstanding corrosion resistance properties.
The AEM Air Bypass Valve is manufactured and assembled in the U.S.A. and is patent pending. There is a foam filter around the bypass valve. Do not remove it. This filter is required for proper operation of the valve while it is active. The foam spring inside the diaphragm provides the proper tension for the valve diaphragm. Do not remove this foam spring.
Read and understand these instructions BEFORE attempting to install this product. If you are installing a Cold Air System (CAS) and an Air Bypass Valve onto a vehicle that has never had a CAS installed on it before then DO NOT cut the inlet pipe until a mounting location for the Air Bypass Valve has been determined. This requires that the CAS be installed first in order to determine a good mounting location for the Air Bypass Valve.
