Be careful with the smaller ones. They usually use teflon seals on the edges of the rotors and they give problems galore on some of them. I had one get sucked into an engine and we had to go back through the whole thing. I vowed after that, if I ever did another blower, it would be a -71 series of SOME sort. While the teflon sealed rotored blowers can boast about tighter clearances and improved boost, if you ever have teflon seal problems ONE time, you'll be forever chasin your tail. Ask me how I know. LOL Just my 2 cents.
