I don't get the comparison. If Chrysler put a supercharger on the 6.1 they could easily get to 550HP... Maybe more?
All GM did was slap a supercharger on the 7.0 LS7(correction 6.2). For a SC on that size motor, it's WEAK! They must have detuned it so it wouldn't beat the Z06. (correction, the 6.2 w/SC is the 09 CTS-V from what I can tell... now the HP sounds about right)
The
PPP 7.0L setup has 519 RearWheel HP w/o a supercharger and runs 11.080 in the 1/4... So yeah, Chrysler could EASILY match those numbers, but it would be too much investment if it was ONLY for bragging rights (ie, not sales)