I made a few pulls this morning messing around with the intake tube, having it installed, and then removing it.
I'm currently running the stock tube and filter box with an aftermarket oiled filter, and the 460/300 "cold air" inlet next to the radiator. I was curious if the stock configuration was a restriction at the ~300 hp level.
There was a little less than 1 Kpa difference between the average tube/no tube readings over a 2nd-3rd gear pull (I aligned the pulls by RPM in Excel, not eyeballing it in MLV), which is probably within the noise, though the "no tube" pulls were the higher ones. The more fascinating thing to me is that the "hump" shifted upwards about 200 RPMs, and that was repeatable. I have no explanation at all for that. Or for the hump in general given that my readings are in the throat of the intake, and there's no tuning effect that far out from the plenum.
I just need to get busy on the turbo setup. Then none of this matters. But it's fun to dig around in the data.
I tried to draw a conclusion from the average RPMdot of a 2nd gear pull, but then realized that difference could just be the slope of the road.