[streetpro]

1 - get some rear air inlets from Corvette C7 (lot of guys replace them with modded/carbon parts)... Ebay?
2 - do careful measurements, try to place it up front as possible (otherwise it will hit the expansion tank and the servo tank on the other side), you have to cut a small portion of the supporting beam of the hood, no big deal (maybe an inch or so, perfectly strong after the mod)...
3 - cover the hood with masking tape to protect the paint...
4 - draw the footprint...
5 - cover the engine room with old cloth, raise the hood a bit to have a clearance for the blade...
6 - drill pilot holes, start with a small, rather "inside" of the shape to be safe...
7 - start cutting with the reciprocal saw...
8 - try fit, fill out the perfect shape, smooth edges, try fit until happy
9 - paint the edges, apply rubber/glue for wind-shields to fill the gaps/secure the vents...
10 - use underside fixing points of the vents to further be on the safe side and not to risk to see it become airborne while speeding up on the highway a couple of hours/weeks later...
11 - sit back, relax and enjoy a beer with your wondering wife saying "do we really need these holes in our hood?"