Abstract: A theft prevention device for inhibiting expulsion of gases from the exhaust of the vehicle to stall to the motor of the vehicle. The theft prevention device includes a housing being designed for coupling to an exhaust system of the vehicle whereby the housing is for permitting exhaust to selectively pass through the housing. A valve assembly is positioned in the housing. The valve assembly is designed for selectively restricting flow of exhaust from a motor of the vehicle to a muffler of the vehicle for stalling the motor of the vehicle when the valve assembly restricts flow of the exhaust from the motor of the vehicle.