Larry, we will have to agree to disagree on this one.
In a system I want full unrestricted airflow starting at the blower and continuinig as far down the line as possible, right to the carpet, then for a nano-second I will exchange airflow for lift and slot velocity and pull that moisture up through the rug and into the wand, then the larger dia. hose will be my friend all the way back to the tank.
Honestly, putting actual Performance aside, I would like to hear from a blower Mfg., their thoughts on taking a blower with a 4" port and reducing it down to 2" or 2.5", and how the warranty would hold up against that criteria?
Actually I think I will try to get their written policy on such a thing come monday, so we don't have to "wonder" any further.