with an idea that my buddy back home in maine still uses to this day. Its a copper tube that coils around the whole intake piping wich was made of aluminum. The tube was filled with Nitrogen and then wrapped in heat wrap to keep ice from forming on the outside and the inside of the intake we used normal car wax to keep the ice from forming there also. We had tested the temps before and after. before the nitrogen the intake air was at 145f at the T-body. After the nitrogen the air was at 55f. It also had a gain of 75WHP on an already 800HP drag Supra. It took up some space but only added 10lbs to the car. Not very usable on a street car.