We feel the Yost Power Tube is one of the best enhancement devices at any cost. With Yost's new design, you will be able to obtain 2 more horsepower than with the previous unit. By installing an atomizer in the main discharge tube, the fuel is converted from globules to a fine mist of liquid providing a cleaner and more profound fuel mixture burn. Yost Fits all S&S Super models B, E & G carburetors