I know it will never happen but, immensely simplify the rules. Set a few minimums and maximums, then let chassis builders and engine builders have at it. It won't do much to trim costs but it might make for some pretty innovative solutions. Look at the Delta Wing car for example; half the horsepower, no wild airplane parts hanging off front or rear, still fast and competitive. I'm still enamored of that car and what it could represent if the rules were just simplified to allow minds to truly be creative.
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