CAT is only Wacker from the 302.7D and down. All other minis 303.5E up to 308E are CAT and will be built in Georgia starting with the 308E starting late this summer. Do you just think hydraulic pumps make power on their own? HP does make a difference when you are driving a hydraulic pump under load. Part of your digging power comes from hp that is able to maintain the pressure and flow of the pump when it is working hard.