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This was my reply to a Camaro hood vent thread few years ago on how I did it:
I did it successfully a while back. I like the simpler the better. Here is what I did.
I made a template with the box the vent came in. cut it out and test fit to make sure the vent fits just right in the hole. I added some tape where i overcut the cardboard so when i traced on the hood i wouldn't trace an overcut.
get two pieces of string and make an "X" on the hood taping the string at the far corners. Bottom left to top right and bottom right to top left. If I remember, the top pieces of string actually got taped to the windshield. this gives you the exact center of the hood. Make a mark at the intersection and remove the strings. with a tape measure, find the center of the hood at the top and bottom and run a string from top to bottom making sure it passes over that mark made.
fold your template in half long-ways to find centerline of vent. set on top of string and tape down where you want it. You can pull string out after template is placed. My outside edge finished placement was 7-3/4" to top of hood. So my cut was a little lower than that.
IMO...that is about the best placement....further down and you risk vent hitting the MAF....higher and it looks kinda funny so high up on the hood.
Tape the hood where your jigsaw might scratch the paint on the outside of the vent. Don't need to tape the entire hood. Don't need to mask off the engine bay to protect from dust. don't be afraid to start cutting into your precious hood. Just don't cut too big of a hole. But also don't cut too small of a hole. Not fun to keep trimming it larger.
I got a 48" aluminum flat bar to mount underneath. You can cut one bar it into 3 lengths that work. Something like 12, 16, 20 inches equals 48 inches. need to get nuts the fit.
