The modded C6 although with nice output, was not a very good comparison to a Z06 for your misfiring shootout.

The Z06 has different gears, REVS quicker with different
internals - lighter valve train and lighter connecting rods made from titanium - and also runs cooler and has less rolling resistance and better aerodynamics than a regular Corvette C6, modded or not. The additional engine size helps with torque at higher rpms also. And the entire car weighs less.