it would be anybody's guess, mine would be corporate bribery, for profits as they all know too well American and international markets still wants big block V8 sportscars...waived off... moreso its probably hardly ticking over at legal road speeds in other words jsut above idle so 'in this scenario' they would have argued emiision is 'low' but in reality every one knows no body buys a vette just to go to the supermarket 
so going pass That silly explanation, the best guess is corporate bribery, they'd call it something else, and probably processed in the chain of commands in such a way no body notices, except corporate lawyers and accountants and CEOs/CFOs and the likes everyone else dont really pick up on it...whats more those bigwigs considers this 'as legitimate business handling and looking after the corporations vitality in other words keeping the business going...kind of like 'if you cut off, there will ne not enough profit for the rest of the ranges to sustain the company'.
about v6, they could have done this 2 sparks, engine management on I6 and get even better results...lol
