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Why would you want air suspension in a track car?

Curiosity about the performance.

Do they use it in race cars? All you have to do is look to what the professionals use and you'd be fine, they do development with millions of dollars so if your worried about performance that would help you, take it easy dude!

Air suspension is not the ideal set up for a strictly built track car. Depending on what type of racing you are doing , a properly valved, gas charged shock is ideal, no matter what the racing surface is.