Has anyone cut into there factory hood to put vents ??

I too would like to know. I like the C7 vents

There's a company that sells them, or used to. Both vents you could hack-in yourself, or a hood with the vents installed. Don't remember who, though.

A few years ago I was getting my tires swapped at a local tire shop and there was another guy there with a Coupe that had a vented hood. Kind of liked the look. But he had a bunch of other aftermarket stuff on the car I didn't particularly like. Not that it matters for the hood question...

The one I saw, the center section was normal and the vents were on the outboard sides of the hood. Same size louvers, though, far as I can recall.