11.6 lbs of boost, 14,600 max supercharger RPM. 6.2L displacement destroked 6.4L with Apache heads (300+ CFM).

The blown 6.2L in the Camaro ZL1 makes 580 HP at 9psi and 638 HP at 10.5psi in the C6 Vette ZR1.

Most guesses for the Hellcat are 680 HP. At the moment Dodge is only saying "Over 600 HP and 575 lb-ft".

Further, Challenger Hellcats have supposedly nailed 202 MPH in testing by Chrysler.