53wanab, if you don't get an answer from anyone here, which I hope you do because I would be interested also, try
http://www.ls1tech.com/forums/ they have a bunch of perfromance info.
1HOT12C, I have the Diablosport and it made a world of difference for my low end once I got my short corrected. Do a search on the this site, a lot of good info on the Predator.