I think thats about right..
Look at SpankinTimes 2011 Mustang GT Build powered by Kenne Bell
Adams Car is making over 700 RWHP on a stock engine form except for the Kenne Bell 2.8s L/C supercharger, upgraded 60lb injectors and throttle body all with 11.9lbs peak boost on Pump Gas.
Follow his build here
http://s197forum.com/forum/showthread.php?t=46029
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2017 Shelby GT350, Ruby Red, H6088
2017 Camaro SS, Hyper Blue Metallic
2016 Taurus SHO, Tuxedo Black
2005 Mustang GT, Mineral Grey - Sold