Lowering decreases the frontal area, so it is good, as long as you can live with the ride.
The airdam decreases the turbulance under the car by pushing it to the side instead of going under and bouncing around on motor and suspension componants. A belly pan is more effective but alot more work. IIRC you get 75% the effectiveness w a airdam but 1/12 the work. Check to see if the airdam is lower or the same height as the lowest componant under the car. If it is you might benifit from not removing it. If it is alot lower than the lowest point it might benifit you to remove it.
So depends, only way to know for sure is test it.
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