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A 'blown',or 'suctioned' slot would do more good at the back of the car,where it could energize an otherwise feeble boundary layer which is at risk of triggering separation
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A case on point: 1500 cubic feet per minute of engine cooling air (not the exhaust) into a ring-shaped slot at the rear of a boat tail. This might have some effect.
The one on the left. This is called a Coanda nozzle.
(aerohead — I'm going to take some Aluma-panel upriver after it thaws and fashion a boat tail for the '58 Baja.)