What is the end game? How do you know that an intake has left no room for improvement?
Perhaps an extremely high resolution pressure transducer sampling manifold pressure and pressure just outside the throttle plates? I must assume that if you are achieving atmospheric pressure in your samples, there couldn't really be room for improvement other than colder/denser air.
With so many other factors that cause power readings to vary from pull to pull, it seems like anyone judging an intake by 1-2hp is doing themselves a disservice. It seems that you would want to isolate the results of the intake alone to know for sure.
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