Ram Air CAI For hood Scoop Hoods?

Welcome to TW!

You realize the hood scoop on the TRD sport resides in a low pressure area of the hood, right? If it was made to connect to the air intake, you would loose hp, as it would take more work for the engine to pull air thru, and against a low pressure spot. In stock form, the air is pulled from a high pressure area in the passenger side fender. Away from engine heat.

 

They didnt cut it out as it wouldnt be "Functional". Its too small, low, and in a low pressure area of the hood.

 

Sticking a cup out a window is your testing method ? Somewhwere on here I have pics, and other info that would help. FWIW, the passenger side fender is made a high pressure area, due to a "Grill", if you will, in front of the tire. As the tire spins, air is assisted into the fender.
I'll try to find the pics showing high and low presure areas of the truck...

Bingo!

 

Here is some pics that might help:




This is a car, but the point conveys. A Trucks aerodynamics are, as we all know, much worse. The reatachment point is near the edge of the windshield.

More info:
Vents and ducts serve many purposes on cars. They are used to direct air for cooling and ventilation. However, they can also be used to reduce lift and create downforce by relieving unwanted pressure differentials. Pressure differentials can occur anywhere that a fluid flow is allowed to enter an area that is difficult to exit. If this pressure differential contributes to lift, or reduces downforce, it is obviously unwanted.
One area where a large pressure differential can develop is the engine bay. The pressure differential is created in two ways. Firstly, as the air flows into the engine bay it strikes the engine, accessories, and firewall, stagnating and raising the pressure in the engine bay. The air flowing over the hood is moving quickly and is at a lower pressure, creating a pressure differential. Because the pressure below the hood is higher than above it, lift is created.
The effect is amplified by the fact that the air entering the engine bay is heated by the radiator and the engine itself. Buoyant forces (the same forces that cause a hot air baloon to rise) are created because the hot air has a lower density than the cool air above the hood. This effectively turns the hood into a hot air baloon, compounding the problem. The problem is again made worse because the engine bay is sealed on the sides and top. This allows the air only one escape path - down. The air is forced to flow down and beneath the car, increasing drag and reducing downforce. Obviously these conditions are detrimental to a car's performance.
However, simply placing a vent in the hood can help reduce the pressure differential in the engine bay, reducing the effect of these phenomena. This solution can be seen on many race cars including JGTC and DTM cars and also on very high performance road cars like the Ferrari F50, Jaguar XJ220, and Lotus Elise.
It is important to note that if the vent is placed too far back on the hood, then it may cross into the stagnation zone at the base of the windshield. If the vent is open to this high pressure area, it may actually force air into the engine bay, compounding the problem that it was installed to relieve.
However, placing the duct in this high pressure area can be used as an advantage. On older muscle cars, "induction cowls" were used to tap into this high pressure area and provide more air to the engine, making more power. For this to be most effective, the cowl should be sealed so that the air is forced into the engine and none is allowed to collect under the hood.

 

Another pic for ya....

Red is HIGH pressure, and blue is LOW pressure

 

Even on race cars:

 

So....Unless the scoop is made taller, wider, and moved about 1 foot more forward, it wont be "Functional" to be used ass a method of producing more power by bringing more air into the engine. The "Cup-out-of-the-window" Testing simply doesnt work.