Don't be taken in by "6.5 horsepower" claims. See the thread topic "What is 3 hp?" There is a big difference between 110 v. universal motors and 220 v. induction motors. 110 v. induction motors fall in the middle, and realistically are rated up to 1.5, maybe 1.75 h.p. Your two 6.5 h.p vacs would not suck as much dust as one 2 hp. dust collector. And would draw more electricity, and would be way noisier.