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A/R stands for Area over Radius.  Area is the size of the housing inlet and radius is the the diameter of the housing.  Before every keyboard warrior jumps down my throat...this is just a basic explanation for the sake of a general overview -we don't need to get lost in the weeds, we'll leave that for scientist and engineers :)The larger the AR number, the larger the housing is.  Larger housings support higher horsepower levels, but take more exhaust gasses to turn the wheel and m …