Review on Efficient 4.5CFM Single Stage Vacuum Pump for AC HVAC R134a R410a Refrigerant Recharging - Rotary Vane Design, 5 Pa, 1/4" Flare Inlet Port (Oil Not Included) by Darnell Evans

I liked the price, my friend has a 3cfm model but it came with a larger diameter vacuum hose. This 4.5 CFM model came with ¹/⁴ inch hose. I believe the hose is slowing down the process. It seems that it has less suction power. As for the noise level, I'd say they're pretty quiet, but I don't know how they're supposed to sound. I can invest in a different type of vacuum hose and some fittings. Just to see if it really sucks.