I do contend, however - as I have all along - that GM will best Ford's 650, and then Ford will best GM's 'whatever', and so forth. I can't see it being otherwise...unless, as I also said, the govt and/or the ins. co.s pull the plug - or put a cap on - the whole process. (The same game was played all thru the 60's, except back then it was a 3 company game.)
Seeing as how the top dog in Chevy's lineup is the 638 HP monster ZR1....I really don't see the Camaro besting that number anytime soon. And if they are, the LS9 is already sitting on the shelves, fully ready to make 650+ hp with minimal calibration changes if they want to. But it'll still be heavier than the Mustang until the next platform change, regardless.