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 Well, technically they did add to the car; tape was applied over the gaps between body panels in a (probably useless) effort to improve aerodynamics. But you're right, the weight-saving was apparently just removing all the loose articles from inside the car (spare tire, etc). They did the ""modifications"" on site, presumably without tools or prior planning, so I doubt anything was done that would constitue modifying the vehicle itself.  (UTC"