Hi costie,I'm surprise you are determind to pull off this plan,yet still I do have my reservations about that air induction to the engine.
Remember that air dams were designed to provide air to the engine bay,not to be use as a air intake.You may regret having that stuff done to your engine if air bone debries gets thru the dam & makes his way to the throttle,what about water on rainy day or bugs,even small birds.I mean common costie,i think you're pushing things beyond limits.
The VX is a "rally inspired" SUV,that's why it comes with a special suspension system & nice aereodynamics design so no big mods is needed to "transform" your nice looking toy to go rally;Plus ask your self if rallying will be a huge part of the VX life,unless you'are thinking becoming a professional rally racer I'll focus more on improving the engine's power & the drivetrain reliability/dependability more then a air dam over the roof.
Adding a dam over means you'll be forced to modify the front side of headliner,less windshield vision,less head room.
The last thread you mentioned this project you asked what we do think about it,many of us answered your ?? 'bout it negativetly & i guess all us can't be wrong.

However good luck costie....PURA VIDA