Agreed- I think the airdam and kamm are nicely done and I expect them to provide positive gains. The mini-skirts... mmmm... I'd like to see them go down to at least axle level... can't say if they're effective as is although as a general rule mini-skirts are very effective!
And you know what I think about rear bumper holes, although cal is right, with a full pan they ought to keep temps in check.