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nose
The whole nose,wrapping well back into the fenders is all in a positive pressure regime and flow separation is impossible there,so under these circumstances I don't think that anything like a VG could do them any good.
If the decals covered and cleaned up a gap in the bodywork that might be a plus.
And once in 'traffic' the car will not perform anything like in practice do to the 'dirty ' air all around it.
If they are leading,then cooling system drag and spoiler angles are probably the critical factors,balancing road-holding and cooling between free'd up horsepower.
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