Listen, you should get blacklines. Your current setup is already really nice; can't go wrong with the M-Sport kit. However, blacklines would reduce a lot of the attention that the red in your taillights create.
Past: '08 E92 335i|JB|wheels|"eater of HPFPs"
Present:'15 Mustang GT|401A|PP|Recaros|6MT
Sig pic unrelated. I like to go sideways and stuff.