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Not sure if it's been mentioned above, but your better two stage compressors allow for higher air pressure. This allows for running better air tools at higher pressures to give you the power to break tight bolts. Most cheaper two stage compressors still only go to just above 100psi. Also when talking real Hp instead of "advertised" a two Hp motor is the biggest you will run on a 20 amp 110v circuit without tripping breakers. This is why 110 units are just toys for any kind of real garage work. If you want to run a nailer or do small projects they are fine.
My suggest would be to get a good professional two stage in the 5hp range. If you can afford to buy high end wheels and superchargers you should be able to afford a good compressor. Lol
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