When I bought my 2006 GS I was looking at a bunch of different cars all 450 hp and above. However I feel in love with the look and "exclusivity" of the GS. My sales guy said that the actual HP was more like 430-440 @ engine, not the published 400hp. Also I have seen 0-60 times in publications ranging from 4.5-4.9 . What is going on. Sales guy said they did that because they didn't want to downplay the 360 modena. How much if any of this is true?