The Airraid modular intake tube installation instructions state to cover the nipple that is for the crankcase breather hose! They supply a rubber cap for this. This, according to the directions applies ONLY to the 2004 5.7 Hemi. If you have a 2003 you are supposed to hook the hose back on with an adapter they provide. Does that make sense? Further, it does not say what to do with the hose that would be just lying there. Any comment on why they do this? Would'nt the oil get hot & nasty much quicker?