What is Elford Throttle Spacer... "Air Chamber Volume", "Venturi Shape for Improved Flow Speed" and "Eliminates Tiers in Air Tunnel" By optimizing the three elements above, it will eliminate acceleration response in the "Startup" and "Intermediate Acceleration Area" which are specific to electronic control throttle equipped vehicles and lead the car to a linear acceleration state. Elford determines the thickness and shape of the spacer not only dynamo tests according to the engine characteristics but also the "sensory effect" in order to make a decision on how easy to ride and feel good. Therefore, we have tested them on various thicknesses and have the most balanced spacer thickness for the product. This is an easy soup up part that improves the engine reach of intake air and makes your car a little more energized.