Grand National Boost Controller can improve the feel of your Buick. Adjust your turbo's power with a Boost Controller. Street or strip, new Grand National Boost Controller keep your car one of a kind. Choose the amount of boost with the Boost Controller for the optimum setup. Limited production, doesn't mean limited options - Check out our Grand National Boost Controller. A Boost Controller is easily adjusted and easily installed. Make your engine the best it can be with a new Boost Controller.