Here's a tricky one: putting an 04-07 STi "park bench" wing on an 02-07 non-STi.
If you simply added the wing because you liked the look and wanted to respectfully imitate the STi brand because you had one or more significant STi parts on your car (Brembos, turbo, trans, etc.), you're probably fine. If you did a trunk swap and removed the badge, you're probably also fine. If you did a trunk swap and were too lazy to remove the STi badge, that's borderline rice. If you kept the badge on because you wanted people to think you have an STi and especially when people ask if your car is an STi and you say yes, then that's definitely a rice move.
07 WRX (Albins 5MT + Blouch 20G)
Jorge Carrillo Tuned (365 whp/340 wtq)