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Not yet. Try filter out and no mushroom cap next. That leaves just all open pipe, and if still restricted, then it is just likely a pipe diameter issue. I don't think bends should play as large of part as the pipe diameter (flow velocity). Also try filter out and filter can lid off.

Sorry I'm late to the party. I hope to soon have time to quantify all of this. I will connect a MAP sensor from a gasoline fuel injection system into the filter minder line, and be able to record the restriction of each component on a scale with good resolution, since MAP sensors inherently do...

With gasoline engines, you reduce fuel and air to reduce engine output. Spark timing can also be reduced with a gasoline engine to reduce engine torque, as is done during the up-shifting with automatic transmissions.