Hmm..
Well I would:
Tint the window's
Get a dual exhaust
Get new headlight's that are clear(Or smoked out)
I personally like big decal DC stickers(Can see one in your window) But I would put a big red dc decal sticker in the rear window
And I would change the rims on it to black with a hole bunch of spokes(not just 5) but if you want to stick with the chrome rims i would get different rims with more spokes - I'm not a huge fan of just a couple of spokes cause I dont like seeing threw the rims, but they actually look nice on your car - I see that you put red outlines on your rims(Why did you do that?) but if you were to get black rims I would get a red stripe around the rim like you have.
People might tell you to slam it(Lower it) But please don't, I would not look good on this car.
I like this car alot, it looks nice.