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The "Pro Iterator" works like the cam iterator, and tests hundreds of combinations to help you reach your goal. If you're planning a new build or simply wanting to maximize what you've already got, the DynoSim is an eye-opening exercise. When you allow the program to work for you, the results are at least inspirational, and at best an optimal way to design the most-perfect engine for your specific application. It's both fun and functional, which makes it a worthy investment.