Use an airsaw with a metal cutting blade, or a jigsaw with a metal cutting or carbide abrasive blade. It also helps to lay down a layer of masking tape where you're going to cut, this will help make a cleaner cut and give you a convenient hig contrast surface to mark your hole on. I have a WRX and a shitload of WRX links, I'll hit the highlights and see if I can find a standard WRX scoop out of CF for you.. You could also try to find an (non-WRX) impreza scoop, it's the same hood with a sweet low profile scoop.. By the way, are you looking for an 04 scoop, or an 02-03 scoop?