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how much
It's not a straightforward call.
1) Some researchers have reported 'optimums' for a given 'lowering' of an airdam.
2) Beyond a certain 'depth', drag increases again ( Brett Herndon ( Bondo ) experienced this on his 2012 F-150 ) ( A Master's Thesis from a Naval Officer reported ditto ).
3) At some 'extreme' depth ( appropriate only on a race course ) drag falls to a 'minimum'.
4) There is a risk that General Motors already optimized the OEM airdam, both in CFD and in their wind tunnel.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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