Help me out here, I am trying to get some tools to help me work on my cars. I bought an aircompressor and am concerned I may have underbought. It is the 20 Gal 4.5 CFM @ 90 PSI compressor from Harbor frieght. I currently have a cheap Craftsman 1/2 impact wrench that I wonder if it will be stout enough. I am looking to do some suspension work like wheel bearing removal and replace. I think I need something with more power like the Harbor freight earthquake tools. My concern is did I under buy on my compressor? I am trying to gauge compressor size and power to air tool. I am probably over thinking this, as my craftsman may be sufficient, I am also trying to educate myself here.