Personally I am using the Stillen bumper and Track spec vents. I chose Stillen because of the simplicity of adding brake ducts even though the fitment isnt great. The Track Spec because of price and known functionality, but it is scary to make that first cut into the hood.
Hood wise you want something with an opening right behind the radiator and would have a bump in-front or have the vent depressed like the Seibon VSII or BD ones. The further back a vent is the less effective it is.
Red and Orange are the best places for air to enter the car, hence why the cabin air comes in right next to the windshield, and blue and green are the best places for air to exit the car, hence why the Porsche 918 has top rear exhausts, and they look amazing too.
