I know there was probably a hundred threads to read on hotboat about this topic but..........nothing here yet. Was wondering what kind of pumps(brand) you guys are using and if there are any to stay away from ? I was looking at the Aerospace and the Star pumps but not sure what rings to run with or how much vacuum. I'm sure its trial and error on the dyno, like everything else. I was told 12'' is a good amount and 14-15'' is too much. Any comments or pics of set ups would be cool. Thanks.