1967 Cuda FB project
I must admit that there is a slight egg shape to the big back windowed cars.
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Looking at vehicles such as the Mazda RX-7 some of them seem much more streamlined with the addition of side skirts that do kick out.
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But the Barracuda is such a classic design to begin with that if you add in too many ground effects I think you'd lose the musclecar flavor those cars had and overwhelm it with the sports car design. - Not saying it wouldn't work but I think there's a tipping point. So far the mods have stayed pretty subtle. The outward appearance still says '60s Barracuda' but looks as though it could have been produced now. - Sort of like how the new Challengers still evoke memories of the old ones.