1). I believe the touring package upgrades your stereo to Bose/XM sat. not the navigation. Navigation allows u to operate stereo thru your screen and adds storage and a few extra features for music.
2). I'm not sure
3) I'm sure the dealer can do anything u want but u will pay out the a$$ for it.
You are better off going to car toys or a custom shop.
4) the paddle shifts will work well on a track. But not as precise as the manual.
Sport package will be your best attribute on the track. If u want to track often it is probably recommended to perform minor upgrades (pads,brake lines, drop n sway.) If u r wanting to do more just get the base and do your own suspension.
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