Now this is just my humble opinion but I think what you have now is pretty fantastic. If you really want to fabricate something that will make a significant improvement, an aero cap or at the very least a tonneau cover would probably be the best things that you could do. The front end is not perfect but it is really good and unless you clean up the aero at the rear anything you do to the front probably won't make a noticable difference.
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-Kevin
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