I am curious. How do you figure out where the tables are in the code? I doubt GM gives you the hookup, and trial and error is pretty risky on a PCM. And I doubt that there is any magical code that says "High Octane Spark Table starts here!". With what we download and upload being a 512k file, I doubt there is much wasted code. I don't want you guys to give away all your secrets...I am just curious how difficult it is to decipher that stuff.