Bam,she looks like an oil well to me! Sweet!
As to the fins,GM added them to their Cd 0.14 Aero 2002,after she was Cd 0.14.
I don't think they were flippant about the mod and there'd be a conscience reason for doing it.I'd vote 'keep 'em.'
PS,if anyone catches their leg on those fins,then they're too close!