There is a practical use for the bypass valve. From what I hear it is to protect your engine if the air filter gets completely submerged in water. i personally don't drive through lakes, but if you wanna take your integra off roading, you might wanna get the bypass valve... turn your CAI upside down and run it as a snorkle. as far as the dents go, i wouldn't worry about it if they are only minor.EpsilonGSR on Aug/21/02 said:If you got enough laying around to spend on a brand new one, go ahead, but I wouldn't get a bypass valve... there really is no practical use for it. It's just something AEM sells to make extra money from those who don't know any better.