According to this, you use them to plug the holes left by the rod that holds the butterflies.
Gerardo
Charge motion delete plugs for use with Steeda charge motion plates.
Are you bummed that you bought a vehicle and found out that you couldn't use Steeda's charge motion plates? Well, Steeda has the prescription for happiness! Steeda's charge motion delete plugs eliminate the butterflies, giving your intake air a smooth shot into the head. Machined from quality materials, these plugs are a great upgrade for your ride. As used on Steeda's Q350 Mustangs, Steeda's plugs reduce turbulence and improve airflow in the intake path for more horsepower and torque! Steeda's charge motion delete plugs require computer recalibration for use.