Have a read of the FI posts and you will be surprised how quickly you pick up what the deal is.
None of us know what 15lb will produce as I don't think anyone has managed it yet.
There's a lot of developement going on now. There's a a lot of different FI projects on the go from turbo, to centrifugal blowers to twin screw and Eatons. Some will be intercooled others not.
Within 12 months our knowledge will have advanced to the point that we will regard 600hp as easy.
There's a competition starting to see which Lextremer can break the 1,000hp figure first.