Once you have used air impacts, you will never go back. Heat, rusty spray, and impacts, the only way to fly on a rusty old car. Not say they won't break things because they can, I think my old half inch ingersol goes well over 450 ft-lbs. That is untill you start to work with stainless and then you realize your impacts are now useless, as I have recently(not to mention all those years of wire feed welder).
Chris