#1: More car modification. I really like the new diffusor and those exhausts.
Those two intakes are well added and fit the style. Taillights are nice.
#2: Background and atmosphere is everything! You did it. But there are not
so many modifications. I like the rear wing, but You just copy and pasted
half of it, mirrored it and that's why you got an extremely strange web url on it.
So vote for #1 because of the modifications!