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A point of clarification...
What Dan said is true, but only in the static case.
In the dynamic case (i.e. when their is flow, such as when you are operating your impact gun) the diameter of the hose makes a huge differance.
Let us do a little experment. Try blowing through a tiny straw, now blow through a 2 inch exhaust pipe. As you can see the harder you blow on a tiny straw the more restriction you feel when you blow. On the other hand when you blow through a 2" exhaust pipe your lungs do not have enough capacity to generate enough restriction for you to feel.
For those who want a little bit more information The Compressed Air and Gas Handbook, Fifth Edition, ISBN 0-13-162611-6, page 824 we find the formula for air pressure drop.
The formula is:
pressure drop = (.1025 * Length of pipe in ft * cubic feet of free air per secound ^2 / (ratio of compression at entrance of pipe* actul internal diameter of pipe in inches^5.31)
^ means to the power of, so 2^3=8
Hope this helps
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