An exhaust reversion prevention plate is installed within the exhaust pipe of an internal combustion engine in order to prevent a phenomenon known as reversion, which causes a reduction of power available to the engine. A curved plate is affixed within the exhaust pipe with a threaded stud welded to the plate. The curved plate has a wave shape resembling a sinusoidal wave with several peaks and valleys, which are angularly spaced equally around the central axis of the curved plate.