The single problem common to most of the centrifugal blowers (Vortech, ATI, etc.) is the brackets aren't rigid enough, and under boost they bend due to belt load and the belts either slip, run off, or get chewed by the pulley.
If using an existing bracket, look at it closely - most have a place where a piece of 3/8 X 3/8 X 1/8" angle can be welded (or even through-bolted) as a stiffener. Enlarge any mount holes to next bolt size, and put a "doubler" (heavy flat washer is good) behind all bolt holes.