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Yes, but I don't spend much time driving a WOT at maximum RPMs. Does a typical ECOMODDER style driver spend much time under high load conditions anyway? Most pressure drop scenarios in fluid dynamics relate backpressure to a function of fluid velocity, somewhere between the square and cube depending on compressability. So my WOT 2000 rpm backpressure is less than my WOT 6000 rpm pressure by a factor of 9 to 27.
I just don't think I really spend much time driving under conditions where backpressure is significant, and it's hard to say that the "louder pipes, less throttle" relationship could not have had any effect at all.
You said it yourself, your MX3 accelerates better but doesn't get better mileage. A high flow setup may have decreased backpressure under high acceleration loads, but under normal MPG style driving, perhaps the stock system did just as well. Perhaps there wasn't any backpressure under those scenarios to begin with.
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