1.Changing all of your dull bulbs (license plate, dome lights, etc.) to L.E.D. really enchances the look of Any Z, especially us dark ones.
2. There are some cool t-shirts in the clothing section classifieds.
3. You could get a burnt titanium shift knob and lugs to match your Ark Exhaust (My Plan
)
4. If you have a radar detector, you could wire it into one of the switch blanks of the center console.
5. You could convert the rear fog light blank to a cool functional one
6. High performance Brake pads
7. Stainless steel brake and clutch lines, and a clutch helper spring
Just a few ideas, I think all can be purchased from vendors except maybe radar cord. Good Luck and have fun!