Instructions to change spark plugs show removal of these two yellow lines (driver side shown but there's 2 more on right side of engine).
May not have to remove them but it would make access easier.
Anybody know what these lines are? Coolant? Vacuum (kind of large for vacuum)?
Was a bit hard to trace their origin.
Please only answer if you know for sure.
Thanks

 

Found it: Supercharger Coolant Lines