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although i don't have any exp. with cordless impact wrenches, i have a couple air impact's. one came with a air tool set & the other with my compressor. the big difference is the ft. lbs of torque they are rated at. the cheap one is 200-300 ish and i can't even take lug nuts off with it, the porter cable one is up around 450-500 ft lbs. the only thing its failed me one was the front lower a arm bolt that was siezed in the crossmember sleeve of my 122.
so definatly look for a high torque value if your going to get an electric impact, at least 400-450 ft lbs.
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