This bumper cover would get you half way to your rear skirt/fairing, in fiberglass...can't post link, it's a carid rear skirt for a NA
Tucking the rear bumper underside rather than the common trim, does a lot to reduce rear "parachute" drag.
Panels for under the nose(your originals are probably missing or damaged) are available off the shelf, not too hard to fab from coroplast, and they do reduce drag(though less with your deep air dam than on a stock nose.
Your boot cover will do more for drag if you fit some curved battens to bulge it up and keep it from flapping.
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