Some of the extra is in the rear bumper, and the rest is in the front end. Euro NCAPS criticized the 450 for poor protection against pedestrian head injuries. The front of the 451 was changed for that reason. Pedestrian injury is an issue in EU crash testing.
4 inches?? I thought the 450 was 98.4 inches and the 451 is 106.1 inches. Thats more than 4 inches difference. My math says that is 10 inches give or take a bit.
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