The above (and very crude) picture is of two of their systems in unison. The blue rectangular bar is their fuel bar (seperate system). Hot air enters the air filter and passes over and through the square tubing that contains the C02. Through the magical wonders of an endothermic reaction the heat from the intake charge is cooled. On goes the newly cold air through the t-body and eventually the combustion chamber. The carbon dioxide is NOT introduced anywhere but the system its self. None of it goes to the combustion chamber. An engine in its rawest form is nothing but an air pump. Air=oxygen. If we throw a bunch of carbon dioxide into the engine it would kill it's efficiency. We (humans) also breath oxygen and exhale carbon dioxide. What would happen to us if we tried to "breathe" and live on the carbon dioxide we exhale? Asphyxiation. The carbon dioxide in this system is compressed, and when the stuff is compressed to a certain point it turns into a liquid and is verrrrrry cold. Venting this concoction into the atmosphere turns it back into a gas but is still very cold. The only system that is not closed is their CryO2 Intercooler Sprayer. It sprays the C02 directly onto the intercooler. I am also doubtful on how efficient the intake system could be as not all of the air would be going over the tubing. Goto the back of your fridgerator and hold your hand near the coils, the air is cold. These systems (save the intercooler setup) are working on the axact same principals.