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You mean a bypass valve, it prevents water from getting into the intake manifold, I believe K&N does'nt offer one which is why i havn't gotten one, not sure about injen though...Originally posted by tearCatcher@Sep 23 2005, 12:48 AM
for a CAI my friend told me to get an AEM because it has a filter or something so that when it rains it wont damage it. not too sure what that means, i dont know much about intake and exhause yet