Abstract: An exhaust system for an internal combustion engine including an elongated tube for receiving exhaust gas and exhaust flow modification structure within the tube interior configured to cooperate with the elongated tube to produce a laminar flow of exhaust gas and modify the flow speed of the exhaust gas due to the venturi effect.

Abstract: An exhaust system for an internal combustion engine including an elongated tube for receiving exhaust gas and exhaust flow modification structure within the tube interior configured to cooperate with the elongated tube to produce a laminar flow of exhaust gas and modify the flow speed of the exhaust gas due to the venturi effect. The exhaust system includes two spaced structural components which form restricted a annular flow path to enhance the venturi effect.

Abstract: A system for improving the performance of a motor vehicle internal combustion engine includes a controller positioned between an O2 sensor. The controller alters the O2 sensor signals and adjusts supplemental sensor signals received from supplemental sensors and sends the altered O2 signals and the adjusted supplemental sensor signals to a programmed electronic control unit which controls operation of fuel injectors.

Abstract: A controller is interposed between the O2 sensor and electronic control unit of a motor vehicle to modify the O2 sensor signals before they are received by the electronic control unit so that a richer fuel mixture is introduced into the internal combustion engine of the motor vehicle than would otherwise be the case.

Abstract: Apparatus for testing and evaluating the performance of an automobile under simulated conditions includes torque applicators for connection to wheel shafts of an automobile and for applying torque forces to the wheel shafts, movable supports supporting the torque applicators and a force applicator for connection to the automobile to apply forces to the automobile. A control associated with the torque applicators and the force applicator varies the torque forces applied by the torque applicators to the wheel shafts and varies the forces applied to the automobile by the force applicator.