Is a N/A VL calais diff the same diff as a VL berlina's??? If so this means then disc brakes can be installed to a VL berlina without any hassles right????

yes, a n/a calais diff can bolt up to a n/a berlina - but there are some differences you have to take into account - the hand brake cable for example. I'm sure there are other people on here that will be able to provide more detail into what else needs to be changed to do so.. im not sure about the master cyl, as a n/a calais came with the 15/16" master cyl stock anyway... please refer back to your original post about this here. http://www.ozperformance.net/viewtopic.php?t=6319 please dont post multiple threads.