That's what I'm saving my S4 tails for- if/when I get my S4 repainted, I'll take out the amber and have the black parts color-matched to the rest of the car.

Till then, I'm keeping the S5 tails. I don't think the stock S4 tails look good on my car.

 

s5 tails on an s5 only and painted trim to match like FC3S Murray's ftw