dumb question no 2

JARblue

You're all over the place man. I'll try to help a little, but it is quite obvious you haven't done much research. Try the search function or Google.

LSD is not needed? What do you mean? And what does it have to do with speed? LSD is for handling, not speed.

You can always add an LSD. You cannot add the sport package later (because SRM). Sport package comes with crappy VLSD anyway, not a true LSD. To add true LSD later, the install will be different based on whether you have VLSD or not (i.e. whether you have the sport pkg or not).

BT and leather are touring package items, completely separate from the sports package. Nav is an extra cost and requires the touring package.

The auto is 7 speed. As for better mpg? That just depends on how you drive. The difference in mpgs between the 7AT and 6MT is going to be negligible provided they are driven in the same manner.

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