At speed the Track Dog Racing™ Air Splitter increases the down force on the front of your Miata lowering the center of gravity and giving the front tires more grip. As oncoming air hits the front of your Miata it creates a high pressure zone. The air splitter sends the majority of this high pressure air over and around your Miata to give it down force. The air that does go under your Miata has to increase in velocity which creates a low pressure area to further help the down force. The air splitter also defends your Miata's front end against scraping and dings. Made from 3/16" thick, high-impact ABS plastic and built to take a surprising amount of abuse. Splitter extends 1.75" at the outer edges and 1" below the radiator opening. Includes all mounting hardware. Recommend painting the splitter for best appearance. For use with the factory front lower spoiler only.