ok does the REVi work with the stock VFAD and do you need to resize the stock air mount to fit it in? just checking before I buy it

you remove the stock vfad you dont use it.

now do you have to open up the stock front opening??

Nope lines up with the same one the stock one uses, if you are going to do this get the ram air intake and the ac and oil screens and do them all at once so you only have to take the bumper off once.