47 will with out a doubt do better with 2.5 hose vs 2.0 and 4 2 dr is APITA setting up all the time.
I think 2.5 is awesome, for us we would run 50' of 42dr it was too much, I call it lift lag, and my son was to fast at wanding when he first started, and with our 45 blower it just wasnt fast enough to put the 42dr under proper vac load, I also have cool cuffs every 25 feet on our hose, Im not bagging on them they are great cuffs, but they do leak a little air that is just normal but it was just too much for the 45 blower, I switched it out with 2.5 and the lift lag is almost gone he noticed it RIGHT AWAY.
But that is with a 45 blower