Interesting to note the differences in the various options too.
My GT is a total "stripper", my only options were the upgraded (but uglier IMO) wheels, locking lugnuts (lol) and a spoiler delete (sort of an anti-option). I took that giant PDF of equipment one day and added up all the weight of various options like theft deterrent/AT/side airbags/Shaker1000/leather seating/IUP/etc. and came up with close to 200 pounds for EVERYTHING.
Not as big of a difference as I had thought or hoped but 200 pounds is about what I weigh, so my stripper weighs as much as my buddy's loaded GT without a driver...LOL.