I just installed my GT40 intake. I tried to duplicate the vaccum hose routing on my stock intake but that did not work correctly. On the stock intake there is a hose that runs from the Charcoal canister under the intake towars the front. My GT40 had no provision for that. I did notice that there was a threaded hole beside the EGR spacer facing the front of the engine. I threaded in a hose adaptor and used this for the charcoal canister hose. Is this correct or os that threaded hole used for something else?