I recently put a AEM CAI on my automatic 00 civic ex. On the OE intake, there were 1) the plug sensor, 2) hose from crankcase, and 3) hose to cool tranny/coolant? I'm not really sure so let's leave it as "unknown". The AEM unit had a place for the sensor plug and one outlet. As of currently, I'm running the 3) unknown hose into that outlet, and running a Weapon R breather on my crankcase. I would like to run the crankcase to the intake, but I don't know what to do about the 3) unknown hose then? What is that unknown hose anyway? I'm guessing it's to cool my automatic tranny, like air leading to coolant, or something. Well, any help would be appreciated, I just need to attach the crankcase to the intake to pass the visual smog check in CA (not that I'd have to worry about it until 2004, but still =]).