So in reading this...I can just plug off the vac line...or is it wise to relocate?That should be the MRC vacuum hose, Intake Manifold Runner Control. Should run along the valve cover to the rear of the intake manifold. Manifold runners open after ~3k rpm for more air into the motor. It seems to be an important tube, although I ran mine for a few days unknowingly capped (wrong CAI rubber gromment was sent). Mine threw codes with it blocked and also limped past 3k rpm's since the MRC's were stuck closed.
If you were to get some more vacuum hose, you might be able to re-route it, although after through the post I linked to more thoroughly, it appears that whole tube is removed in the 2017 and the drivers side is just a vent. Explains why I got codes with the vent blocked. but you might be able to just remove it and cap your CAI.
I'm linking to another forum where I found a Vacuum hose diagram. Sorry if thats not allowed.
https://thefactoryfiveforum.com/showthread.php?27422-2017-Coyote-Vacuum-System
Hey Dennis....just thinking outside the box....got a 2014 Stang engine cover that. They say won’t fit out Coyote motors......well, they’re wrong! A few more subtle things under hood and a transformation occurs!! the area in yellow will be smoothed/Painted and a decal added!!!!!! all grey plastic items will be replaced with factory black with red highlights!!!!Good thinking Rick! Like to see when you are done