I think the difference in the V-6's will be one will be a normal engine and the other will be a direct injection like on the CTS. I am hoping that the V-8 will be at least 420-450 hp and is called the Z28. If they bring annother V-8 out during later production I think it will just be some simple tuning like heads or pulleys maybe a chip, all stuff I think most of us can do in our garages.