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navig. extra weight?

619 Views 12 Replies 8 Participants Last post by  TEG
I remember reading this earlier from a post... does the navagation unit add that much extra wait to effect speed? how much is it?someone had said taht people are adding extra stuff to the IS and blaming them for their IS lacking speed...
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If you didn't have to worry about flats, you could remove the spare tire and save some weight. Although I guess that would make the weight distribution worse.
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