The owners manual PDF for the 05' shows the addition of the center gauges and the 6 speed for the SE-R. But fails to mention the 18" wheels or and LSD of any kind. I'm sure they would include it in the manual if they have the other stuff in there. I'm thinking they may have ditched the 18" wheel thing. I also think it isn't gonna be any faster than a manual altima is now. More horses but also more weight. So maybe better handling/braking. But minimal acceleration difference. nissan-techinfo.com for PDF.