impact wrench vrs breaker bar, on high risk bolts Options

[swl]

I'm going to be doing a lot of dissassembly over the winter. Many of the bolts I'm working with will not have moved since the day the car left the factory. So far I have been lucky. Only casualties have been bumper bolts and one rotor retainer screw. I've learned that a sharp rap with a hammer on the breaker bar is preferable to just torquing it. I've never worked with air tools but that is basicly what an impact wrench does. So my question is whether or not an impact wrench is the right tool for removing things like exhaust headers. Or is it just too powerful for risky bolts?

[914Sixer]

Prior to any disassembly I try and soak all bolts with a penetration oil. I use my impact wrenches all the time. Check to see what the torque of your impacts. I use my 450 to remove axle nuts and suspension parts. The engine parts only take a small amount torque so don't use any thing too large.

The impacts are good because they do the hammering for you prior to the bolt coming loose.