(is not in response to z28, it is to a-ron) hmm, what do you think nitrous dose, and yes they do make kits to spray c02 into your engine weather a cold pipe or runners. I guess you have never heard of methanol injection before, also water injection is also a method used to cool the combustion chamber. methanol can lower inlet temps 60-100 degreese.

Many water injection systems use a mixture of water and alcohol (approximately 50/50), with trace amounts of water-soluble oil. The water provides the primary cooling effect due to its great density and high heat absorption properties. The alcohol is combustible, and also serves as an antifreeze for the water. The purpose of the oil is to prevent corrosion of water injection and fuel system components. Because the alcohol mixed into the injection solution is often methanol (CH3OH), the system is known as methanol-water injection