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Thanks for the replies everyone. What I wasn't sure about was the E38/E67 hardware differences. Could a V6 E67 ECM control a V8. But thats been clarified now. As indicated above any ECM will work...

Thanks blindquirrel. I'm not fixated on a COS I just don't know any different :-). My last tuning venture was on a Gen III running a 2Bar SD tune so the COS was required. Gen IV seem to have a...

Okay I think I'm making progress now..

Vehicle, Throttle Body, Gas Pedal, Service#, ECM, OS
2011 CTS-V 6.2L Supercharged, GM GENUINE 2173151 {#12601387, 12629992}, GM GENUINE 25858067, ...

Here is a list of PN for various configurations I've come up with. Based on the below it seems that the E67 is my best choice in terms of throttle body and gas pedal compatibility.

If I used OS...

Could someone help get me pointed in the right direction please. Years ago, thanks to this forum and the support of many of its users, I was quite successful in getting my supercharged LS1 up,...

Sounds to me like you may have a problem with the ground wires. Perform a quick test. Try adding a ground wire in parallel with the fan ground leads. One end to the fan the other end of the wire...