This bodes well for the LT1. E85, stock direct injection fuel system and low boost of 6 psi. 397/425 power and 13.89 at 100 in the quarter mile. The power and torque curve is completely flat. They think there's more in for the stock fuel system as well.
http://www.gmhightechperformance.com/tech/1308_2014_silverado_lpe_supercharger_testing/
http://www.gmhightechperformance.com/tech/1308_2014_silverado_lpe_supercharger_testing/