How to properly remove dampener bolt?

I see that someone referenced an impact gun for $40.00. If that’s the case I may of considered an impact gun. I just thought for $40.00 all you get is a cheap Chinese knock off that isn’t durable and I thought you needed additional hardware to run one? Like an air compressor that can handle the gun specific psi and hoses etc. If that is the case then you’re into it for much more than $40.00. Maybe I’m thinking wrong?