I am new to dust collectors always used a shopvac. I have HF 2hp DC gave $40 for it. I was reading Bill Peints cyclone article so I made some calls and can get his 18" cyclone built for $140 and fit my motor and impeller to i, don't know how many cfm it is just didn't know if it is worth doing or if it would even make a difference. Thanks for any help.