Sunfire Throttle Body Spacers are a popular upgrade. Throttle Body Spacers increase the gap between your air intake and engine block. The Sunfire Throttle Body Spacers really brings the sport factor out in your car. Air is added to the combustion cycle more efficiently with Throttle Body Spacers. Throttle Body Spacers add horsepower. Get the added benefit of better mpg with a Throttle Body Spacer.