The exhaust gas from a vehicle (1) engine is used to provide electrical power to a load. The exhaust gas drives one or more turbines positioned in the exhaust line which in turn drives an alternator. A controlled bypass gate and passage banking the turbine can selectively pass a desired portion of the exhaust gas through the turbine while the balance passes around the turbine. An automotive exhaust system having an exhaust gas powered electrical system powered by the exhaust gas which leaves the engine (10) through an exhaust manifold (20). The exhaust system is of the single-pipe exhaust variety, but it could also be a dual pipe system or some other configuration. The manifold (20) is connected to a bypass gate valve (30) that can channel the exhaust gas from the manifold (20) through a turbine input manifold (42) to a turbine (40) and a turbine bypass (50).    Powered by the exhaust gas, the turbine (40) drives an alternator (60) and the exhaust gas exits the turbine (40) through a turbine exhaust (70). The turbine exhaust and the exhaust bypass (50) are both connected to an exhaust pipe (80) leading perhaps to a. muffler. The. turbine (40) can be sized to maximise its output over the desired operating range of the engine. The bypass gate valve (30) is controlled by a bypass controller (32) responsive to the speed of the alternator (60) and perhaps the load conditions. The speed can be measured as a function of the alternator shaft speed or the alternator output voltage. If the turbine speed is too high to properly run the alternator, a gear reduction unit (44) can be inserted between the turbine (40) and the alternator. A rectifier (62) rectifies the output of the alternator. The output of the rectifier provides power to a variety of loads commonly found in an automobile such as a water pump, radiator fan, air conditioner compressor, and a power steering pump.    ADVANTAGE -   Decreases the load on the engine and improve its performance. Zero to 100% of the exhaust gas can be directed by the bypass gate valve through the turbine.