Big loads are made fashionable with Super Duty. Throttle Body Spacers increase the gap between your air intake and engine block. Super Duty are a add-on for function and appeal. Air is added to the combustion cycle more efficiently with Throttle Body Spacers. Improve the appearance of your truck with Super Duty. Throttle Body Spacers add horsepower. Get the added benefit of better mpg with a Throttle Body Spacer.