hey big_p31, heres how I thought of it. when i got my red/white tails i noticed the same characteristic. i too was pissed, but then i realized its not really a crack, both have that line in the same spot and in the same patten. further more if you try to run your fingernail along it you can feel you finger elevate slightly revealing that its not a crack, but for some weird reason, its the design. why??? i dont know. what really bugged me was they dont fit right on the 3.5s. They actually reshaped the curve of the light. so they dont match the pattern of the lightss that dont light up on the trunk. I dont know how or why toyota would even think to do this. no aftermarket tails match the design of the 3.5s (atleast that i know of) but anyway, yeah its design, not a crack.