No info on hood just modeled it off sti rally cars. I might do some tuft testing at some point. After installing my splitter my h20 temps spiked upwards of 225-230 f. Even driving 65 in 6th gear I could not get my temps to drop off. I had to do something and this was the cheaper option . I added the holes and I Used 1/2 inch aluminum angle to help pull air from the hood and now my temps are usually around 200f with spikes to 210. I felt if it did not work I would buy a proper carbon vented hood. I have a track event coming up soon I will let you know how well the hood works.