Will is right the air going in to your engine is more than enough, but it gets pre-heated going in to the engine, then it stays there getting hotter. youll gain more getting it out so that more cooler air can go in. But you can still fab something cool looking that might not be 100% ment for performance, nothing wrong with that.
Dont let people tell you "dont doit". If you have the time, space, & patience... go for it.
fiberglass is not that hard to work with. I did my own hood scoop & it wasnt that expensive. Look around & youll find tons of info for fiberglassing, or just find a shop that can fab one for you.
Best advice I could give you: remember your driving a Pontiac, & try to stick to your roots. At the end it looks best.
2001 Blue SLE - 1995 Black SSE - 1988 Black GTA