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A couple other points:

Stainless lug bolts are not a great idea on our cars with alloy wheels. There is a high potential for galvanic corrosion which could cause early failure. Stick to OEM quality.

The op discussed really stuck bolts when changing his rotors. This may not have been an air wrench problem at all. The top bolt on our caliper is often frozen in place due to high heat and corrosion over time. It is a common problem and much worse in damp seaside communities or regions with salted winter roads.

Yes an impact wrench is a useful tool when used correctly. Just finish with a hand torque wrench.