I'm fixin to get a K&N filter for my car, but i'm gonna get some custom work done to fit a tube on and extend the filter away from the throttle body (just for the sake of looks). right now i just have the stock rubber hose leading into the throttle body. when facing the engine, on the left side of the rubber hose, about 2 in. from where it connects to the throttle body, is a metal hose aoubt 1/4in. wide that leads into the engine block. any idea what this is? when i put in my new filter, will i need to attatch the metal hose to my air filter tube? thanks of your help, cause i have no idea what this thing is... also, if any of you have built a custom air intake and used metal tubing.....what kind should i use? i heard you have to use pretty strong stuff cause cheaper stuff will get too hot. also, do they sell pre-polished tubing or will i have to buy regular aluminum or something and polish it myself? as soon as i finish this mod i'll post the pics on here, it's gonna look bad thanks yall