I swear it seems that way. I came home parked the 300C and decided I should run the Z a couple of miles since I really haven't driven it since the 300 found it's way home. Anyway I was getting on the Z after a couple of minutes and it seemed just as fast but nowhere near as torquey(is that a word) as the 300C. It was about 55 degrees out for both cars, the Z has 29,000 miles on it and C has about 1000 miles on it. From what I hear the 300 may open up a little more after some more miles. Man if that is true I'm selling my Z!!