Abstract: The apparatus and system for integrating an electric motor into a vehicle may convert a vehicle from an internal combustion vehicle to a hybrid-electric vehicle. One or more electric motors may be integrated into a powertrain between an internal combustion engine and a transmission. A supervisory controller may monitor and control operation of the internal combustion engine, clutching assembly, transmission, one or more electric motors, or any combination thereof to add mechanical power to the powertrain, remove mechanical power from the powertrain, or neutrally balance the transfer of mechanical power between the powertrain and the one or more electric motors. This conversion may be operable to produce torque from both internal combustion and electrical sources and may be operable to recover energy via regenerative braking. The conversion may be performed with little downtime and with the basic fundamental knowledge of a savvy car enthusiast.