Again the gt500 is in a different class (guess you can call it a subclass) it standard mustang gt 5.0 (switch is the same/in the same class) as the camaro SS and the challenger srt8.
What the hell is a ZL1? I have no idea what that is (I thought about that for 20 mins.) Are you talking about the ZR1 (the supercharged vette?).
The cts-v is a supercharged Car watch what dodge could do if they put a factory supercharger on it. Also on a side note the 6.4 produces more HP than the camaro SS and the mustang gt