First of all, welcome to the site.
Second, check out the New Member Forum.
Third, if you do a search for "ram air" and/or "hoods", you'll find this topic has come up more then a couple of times. I don't believe anybody makes a ram air or cowl induction hood for our trucks. I think you're stuck with doing a custom job.
Do you want this type of hood for looks or have you done engine work? I need to have a cowl induction hood fabricated and am working with a body shop next to my brother in law's auto shop in Skokie (Chicago suburb) to have one custom made.