Will one of those 99 compressors from harbor freight tools let me use wrench to remove screws or will i be running out of air

 

it will work, but your reserve capacity won't be much... impact wrenches require 90 psi, so, not a ton of pressure - very doable, but quantity of air could be an issue... I don't know how big of a tank that will have, but at minimum if you are going to be using air tools, 3.5 gallon if you are patient, 5 gallon is better, and 10-12 is enough for home use...

 

I just got one today HR 8 GALLON , 115 PSI AIR COMPRESSOR it on sale for 89 and 15 % discount on top of that. It seem as better unit as it requires oil. It is rated Air delivery: 5 SCFM @ 90 PSI; 6 SCFM @ 40 PSI. I hope is not too bad. I just wants to replace few suspension parts on my sc300.