Woh woh woh, if i remember correctly, the breather hose nub should never have to slide through the heat shield. Have you tried sliding it through the other way?
No offense, but the installation has been quoted by magazines as being "monkey simple" and I (being an idiot) was able to install it in 30 minutes in the dark and most of that was fighting with the hemi engine cover
So if your struggling with something, your may be doing something wrong. Try installing the intake tube first, and attaching the heat shield second.