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Part of the problem is defining "low restriction". After all, a 4" pipe that's 6" long has very little restriction on a 7-liter motor running 9000 RPM, right? It does offer restriction to a 1.5L motor running at 2000 RPM, because the velocity absolutely sucks at that flow rate.
The 1" pipe that is 4 feet long would likely offer less restriction to the little motor at low RPM than the big fat pipe does. But it would offer a whole lot more to the big motor at high RPM.
So, "low restriction" seems to be a very general term that can mean a lot of different things to different people.
-soD
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