It all depends on the use of the vehicle. Cool air is better, on a race car. warm intake is better on a street car. I had a car (not mopar) one time, that had the manifold heat blocked, and cool air ducted from the grill area. Driving on the interstate in a cool, about 45 degrees, damp day, the car started losing power, and finally died. Got off te road, popped hood, didn't see anything wrong, started up, and drove off. After several times of this, I found that the carb was actually getting blocked with ice formation.
On my turbo engine I had to heat the carb adapter with heater water, to keep ice from forming on the outside, which caused fuel puddling, and surging.
