what makes it run differnet when cold?

[rbohm]

that idea has been tried many times with no results other than the car becomes a bit heavier(not a good thing when you are in a weight restricted race class) and no power gains at best. if you are at the dragstrip, what you want to do between runs is ice down the intake as that will help through the first 300-400 ft. after that the intake has warmed up to the temp it would normaly run at, but likely you have gained a bit on your opponent who didnot ice the intake, and that may be enough to put you in the win column.