And the wider tires they stuck under them.
Actually, that isn't the actual car C&D used - I doubt they added the flares on theirs for the test.
I thought this might stir things up a bit.
I agree: it's not the extra length itself, but what they
did with the extra length. They could have produced the same shape in the same overall length if they really wanted to (ie. designed in from the start, not as a bolt-on addition).