Installed this kit: http://www.ecstuning.com/BMW-E92-335...Lines/ES250604
Managed to get the blasted mid lines replaced along with all the main corner lines... whoever engineered that solution needs to be drawn and quartered. Completely stupid design.
Anyway, I know others have done this install with a regular flare nut wrench, but I found the job much easier (but still not easy by my definition of the word) with this $15 tool... highly recommended:
Tool linkie here
Any questions regarding this mod, feel free to ask.