While tail lights doesn’t change how a car performs, it’s a small mod that can do big things for the aesthetics, modernizing the looks of some cars and sometimes completely changing the feel from looking at a car.
Car Shop GLOW tail lights is something I’d like to see in the future, here are some examples of their products
FD RX7 with the v.1 lights
Honda S2000 w/ their v.3 lights
Honda NSX v.1 lights / FD RX7 v.1 lights
Toyota Supra (Left is stock, right is their v.2 lights for comparison)
edit - I don’t know if it’s spelled taillights or tail lights