2. Is the system tested in “closed position,” the same way it will be when you drive your car or truck? All Cold Air Inductions kits are designed as closed systems. This means that we don’t use the top of the hood to seal our air boxes. We think this is more precise for air and heat control, but it also makes a big difference in claimed power numbers. You don’t drive down the street with your hood open, do you?

3. Not all dynos are equal. Or more to the point, you can’t compare power numbers generated on two different dynos. There are correction factors that professional dyno facilities are supposed to use to make them comparable, but the reality is that there are just too many variables between facilities, equipment and operators. So when you shop for a cold air intake – and you’re sure that the power curve you’re looking at is actually for the vehicle you have – look at the difference in power between before and after, not just the peak power with the system installed.