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The BorgWarner S400 and S410SX turbos are SUPER popular for CAT, Cummins, and Detroit trucks.  While these turbos are a little different, they share the SAME 96MM/88MMturbine wheel, which means all the exhaust housings are interchangeable. The available housings are: 1.15 A/R, 1.32 A/R, 1.45 A/R, 1.58 A/R, and 1.65 A/R.  You will notice that the 1.15 A/R and 1.65 A/R housings are missing from the photos, that's because we virtually NEVER use these housings, more on that later …

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 …