In the EV industry, you will encounter several terms for kits of different parts. Different manufacturers have different terminology that they use for different systems. For example, Netgain has their Hyper 9 kit which includes the motor, inverter, motor controller, wiring harness, and contactor. Cascadia Motion calls their motor and inverter an Integrated Module, but that package does not include wiring harnesses, plugs, or anything else you need to make the system work. Some suppliers sell an EV Kit which can often include everything you need except the batteries.  At Legacy EV, we call our complete EV conversion packages - Integrated Systems, which include everything you need to make the wheels spin. These Integrated Systems come with the complete motor system, charging system, coolant system, battery system, all contactors, relays, wires, and wiring harnesses you need to get power to the wheels. It is up to the builder to figure out system mounting and battery boxes, although we do offer that as an additional service with each of our kits.