Would you declare non performance enhancing mods , such as osir paddles , led lights chrome switches carbonio intake , kn filter etc etc.
I dont see why people arent getting this yet.
Insurance companies are out to make money, they are just like any other business.
You insure a standard car. If you modify this, they will want to know. If they dont know, and you have an accident, your giving them ammo to not pay out. They sometimes dont even need to prove the said item caused the accident.
Non performance or not, its worth telling them. They normally charge an admin fee for stuff like that, so do loads in one hit and youll be fine!