The ZR1's had 2 injectors per hole and had a keyed switch in the dash that would shut one set of the injectors off and might have backed the timing off a little. The switch was marked valet and power if I remember correctly. That's the only thing like that I can think of and I'm pretty up on vettes.

at first, power boos buttons i thought you were talking about nitrous!

GM has engineered the PCM's so the torque management cannot be removed. It is there to save the transmissions.