It has a particular style going already, some things might clash like stripes and plaid. Fender skirts and peep mirrors would fit right in.
Things you do underneath or in the engine compartment could make a lot of difference. That deep airdam makes sense if there's no bellypan, but if you smooth out the underside you could trim it. How is it on speed bumps? Shrouding the radiator might be needed. If you have an air cleaner with a snorkel intake, just putting a bellmouth on that will help. See
Autospeed.
As for the rear: Dodge Charger sail panels? If you built a boattail that covered the stock taillights you could do something like this:
How about fender skirt and a diverter that tie together as a single shape by material or color change; sort of a combination of these:
To get started on the details, ponder this:
My best guess is it says 2-4° is the sweet spot between lift and drag. And little circles are better than little triangles.