[quattrorunner]

You'll get lots of negative comments on the subject here.
First of all, air to air works. Second the engine compartment is smaller than you might think. And third, you'd have to make a system which doesn't seem too hard but I've never done it so I don't know.
You want to fit a duck which I think is awesome.
I've seen lots of different air to air inter coolers fit under a standard deck lid or a duck. And I've seen a duck fit an Intercooler too.
Do a search on the subject. As a hint, use google, most likely it will lead you back here but it's quicker/easier.
Good luck.