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Exhaust pulses happen at different times right? If you wanted better flowing exhaust you need to put larger exhaust on your machine. That's not the purpose of the H pipe. I always use a smaller diameter pipe for my H pipes. Regardless of RPM it serves the same purpose.
Here's my H, and a pic of my super 40s, I like how the exhaust looks, and you can see it when the trucks parked coming off the headers.