my additions to the original list:
windshield banners
clear tail lamps
"euro"/altezza tail lights
rear window decals that cover a majority of the window (Mustang logos seem to be popular)
tacky, gaudy, over-styled body kits
poser badges (GTR Maximas, Civic Type R's, V6 Mustangs with Cobra badges, etc.)
washer nozzle LEDs
decals/stickers all over the car (like everyone is sponsored or something?)
don't like any of them...