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As far as the weight differences, per Ferrarichat:
- Chassis reinforcements with additional sections front & rear in the USA cars, which the Eu cars do not have. Note that some Eu cars have the adjustable suspension system which adds some weight.
- Body reinforcements in the front hood, within each door, and in the rear hood of all USA cars. The front & rear hoods are noticeably heavier than those pf the Eu cars, which are quite flimsy in feel if you are used to operating a USA car. Also, the addition of bumper strips front & rear in the USA cars accounts for some weight.
- Interior safety components for USA cars such as automatic seat-belt equipment, slightly heavier 2-piece seats, knee-bolsters etc. Note that some Eu cars do not have glass side-windows, but rather plastic sliding windows, which saves some weight.
- USA cars have aluminum gas tanks as opposed to rubber bags in the Eu cars. Emissions-control components are fitted to the USA cars. The USA cars have a slightly different gearbox, but negligible weight difference here. Many cars both USA and Eu wear Tubi straight pipes and although not original equipment should be noted as it is a significant weight savings over the large factory system.
Ferrari spent (if I remember correctly) in the neighborhood of $10-12 milllion USD to modify the F40 to meet US safety regulations, which basically showed up in the above changes.
